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Leg Anatomy: Complete Guide with PartsNamesFunctions & Diagram

📅 Published on May 162024 | 🕒 Last updated on November 122025

Overview of Leg Anatomy

The legs are a part of the lower limbs of the human bodylocated between the knee and ankle. They play a vital role in supporting body weight and maintaining balance.[1] It also enables movement such as standingwalkingrunningclimbingand even complex activities like dancing or jumping.[1] The parts of leg anatomy comprise several key componentsincluding bonesmusclestendonsligamentsjointsand nerves. They work together to provide strengthflexibilityand coordination.[1][11] The largest bone in the bodythe femur (thigh bone)connects the hip to the knee.[2] Below the kneethe tibia (shin bone) and the thinner fibula form the lower leg.[4][5] The thigh lies between the hip and the kneewhile the calf comprises the back portion of the lower leg.[1] The shin refers to the front part of the lower leg where the tibia is located.[1][4]

Human legs are unique in evolution because they are specially adapted for bipedal locomotion (walking on two feet). This adaptation gives us efficiency in movement compared to most animals.[1][2][19] Anatomical differences exist between male and female legs—for examplein hip angleknee alignmentand bone length—but the overall structure and function remain the same.[17][2]

In this articlewe will explore leg anatomy in detailcovering the major bonesmusclestendonsligamentsjointsand nervesto understand how our legs work and why they are so essential for daily activities and overall mobility.

Leg Anatomy Diagram

Detailed human leg anatomy diagram showing major parts including femurtibiafibulapatellathigh musclescalf musclesknee jointankleand foot with labeled namesdiagram and functions.
An anatomical diagram of the human leghighlighting key parts such as bonesmusclesand joints for a better understanding of leg structure and function.

Parts of the Leg

Leg Bones

Joints

Leg Muscles

  • Thigh
  • Gastrocnemius
  • Soleus
  • Tibialis Anterior
  • Peroneus Longus 
  • Peroneus Brevis

Tendons

  • Achilles Tendon
  • Tibialis Posterior Tendon

Ligaments

  • Anterior Cruciate Ligament (ACL)
  • Posterior Cruciate Ligament (PCL)
  • Medial Collateral Ligament (MCL)
  • Lateral Collateral Ligament (LCL)

Leg Bone Anatomy

Femur

The femur or thigh bone is the longestheaviestand strongest bone in the human body. It plays a crucial role in supporting body weightmaintaining postureand enabling smooth movements like walkingrunningand jumping.[2][1]

The femur is divided into three main parts:

  • Proximal end (upper part): It connects with the hip bone at the hip joint.[2][15]
  • Shaft (middle portion): It is the longcylindrical body of the bone.[2][15]
  • Distal end (lower part): It connects with the tibia and patella (knee cap) to form the knee joint.[2][15]

The femur also acts as a weight-bearing bonetransmitting forces from the hip to the knee and giving the body strength and stability.[2] It serves as an anchor point for several musclesligamentsand tendons that control leg movement and balance.[15]

Inside the femoral shaftthere are two types of bone marrow:

  • Red bone marrow – It is responsible for producing red blood cellswhite blood cellsand platelets (essential for oxygen transport and immunity).[2]
  • Yellow bone marrow – It mainly stores fat and serves as an energy reserve.[2]

Because of its strength and vital functionsthe femur is often studied in orthopedicsanatomyand sports medicine to understand mobilityfracturesand overall skeletal health.

Detailed diagram of the human femur bone anatomy showing partsnamesand structure including headneckshaftcondylesand functions.
Illustration of the human femur bone with labeled parts and structure for better understanding of anatomy.

Read More – Femur Anatomy: Complete Guide with PartsNamesFunctions & Diagram

Patella

The patella or kneecap is a triangular and flat bone in a central position at the front of the knee joint. It helps to connect the femur and tibia in the knee area.[3][11][16]

The main role of the patella comes during the process of knee extension.[3][11][16] Alsoit has another critical functionwhich is to facilitate the easy movement of the knee during both flexion and extension.[3][11][16]

Additionallyit acts as a protective shield for the anterior surface of the knee jointsafeguarding it from potential harm.[16]

Tibia

The tibiacommonly known as the shin boneis one of the two major bones in the lower leg. It serves as the main weight-bearing bone of the body. It is largerstrongerand more vital for support compared to the fibula.

The tibia connects with the femur at the knee joint and with the fibula and talus at the ankle joint. It is positioned on the inner side of the leg and runs parallel to the fibulastretching from just below the knee down to the ankle.[4]

From a functional perspectivethe tibia is responsible for supporting body weightmaintaining balanceand ensuring stability during standingwalkingand running.[4]

It acts as a crucial link between the thigh and the foot. It allows smooth movement while protecting the internal structures of the leg.[4]

Fibula

The fibula is a longthin bone in the lower leglocated on the outer side next to the larger tibia. Unlike the tibiait does not carry much body weightbut it is essential for leg stabilitybalanceand ankle movement.[5]

  • Upper End (Head & Neck): At the topthe fibula has a rounded head just behind the tibia’s headfollowed by a narrow neck.[5]
  • Shaft: The middle section of the fibula is called the shaft. It is triangular in shape with three surfaces—lateral (outer)medial (facing the tibia)and posterior (back).
  • Lower End (Lateral Malleolus): At the anklethe fibula widens to form the lateral malleolusthe bony bump on the outer side of the ankle. This part connects with the talus bonehelping form the ankle joint and preventing excessive side-to-side movement.

The fibula is tightly linked to the tibia by the interosseous membrane.[5] It is a strong sheet of connective tissue that runs between the two bones.

This connection provides stability and ensures proper leg function during walkingrunningand standing.[5]

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Leg Anatomy

Leg Bone Anatomy

Start the Quiz on Leg Bones Anatomy.

1 / 10

1.

The distal end of the fibula creates the lateral malleolus. True or False?

2 / 10

2.

Which bone’s distal end articulates with the talus and also forms the fibular notch for the fibula?

3 / 10

3.

Which bone has a trochlear groove for the patella to glide over during knee motion?

4 / 10

4.

Which of the following bones forms the hip to knee connection (thigh region)?

5 / 10

5. The groove on the posterior surface of the tibia called the “soleal line” is a landmark for muscle attachment. True or False?

6 / 10

6.

Which bone is the smallerthinner bone on the lateral side of the lower leg that provides structural support but is not the main weight-bearing bone?

7 / 10

7.

The smallest long bone in the leg is the fibula. True or False?

8 / 10

8.

The fibula contributes to the upper ankle’s stability by forming which feature?

9 / 10

9.

The tibia articulates proximally with the femur and distally with the ___?

10 / 10

10.

Which bone’s proximal end forms the patellar surface (trochlea) where the patella glides during knee movement?

Your score is

The average score is 60%

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Leg Muscle Anatomy

Thigh

The thigh is the upper part of the leglocated between the hip and the knee. Its main bone is the femurthe longest and strongest bone in the human body. The femur supports body weight and helps with movement.

The thigh is divided into three main compartmentsand each has its own musclesnervesand blood vessels that work together for movement and stability:

  • Anterior Compartment – It contains the quadriceps muscleswhich straighten the knee. They are important for walkingrunningclimbingand kicking.[7][15]
  • Medial Compartment – It is known as the adductor group. These muscles pull the legs inward toward the body’s midline. They help with balanceside-to-side motionand controlled leg positioning.[7][15]
  • Posterior Compartment – It includes the hamstring muscleswhich bend the knee and extend the hip. These muscles are essential for sittingstandingjumpingand sprinting.[7][15]

All these compartments are separated by a strong connective tissue called fasciawhich gives structureprotectionand support to the thigh muscle.

Detailed illustration of thigh muscle anatomy showing quadriceps (rectus femorisvastus lateralisvastus medialisvastus intermedius)hamstrings (biceps femorissemitendinosussemimembranosus)adductorsand sartorius with labeled parts and functions.
An anatomical diagram of the thigh muscleshighlighting quadricepshamstringsadductorsand sartorius with their key functions.

Read More – Complete Guide to Thigh Muscle Anatomy: Learn PartsNames & Diagram

Gastrocnemius

The gastrocnemius musclecommonly called the calf muscleis one of the largest and strongest muscles in the lower leg. It has two parts (the medial and lateral heads) that start just above the knee and join together at the back of the legattaching to the Achilles tendon at the heel.[6][10]

This muscle crosses three important joints:

Because it spans multiple jointsthe gastrocnemius plays a key role in leg movement and stability. Its main functions are:

  • Plantar flexion – pointing the toes downwardsuch as when standing on tiptoewalkingor pushing off the ground.[6][10]
  • Knee flexion – helping bend the knee during movement.[6][10]

These actions make the gastrocnemius essential not only for daily activities like walkingclimbing stairsand standingbut also for athletic movements such as runningsprintingand jumping.

From a muscle fiber perspectivethe gastrocnemius is rich in fast-twitch fiberswhich are designed for quick and powerful movements. This makes the muscle highly effective for bursts of speed and strengththough less suited for long-term endurance compared to muscles with more slow-twitch fibers.[6]

For sportsexerciseand rehabilitationkeeping the gastrocnemius strong and flexible is crucial. Proper strengthening and stretching improve ankle stabilitybalancemobilityand overall athletic performance.

Soleus

The soleus muscle is important in the lower leglocated deep in the calfand works closely with the gastrocnemius muscle. Togetherthese two muscles form the triceps surae.[10]

The soleus has a complex structure. It has many muscle fibers that attach to different places on the leg bones. Most of these fibers start below the knee and go down to the heel bonewhile some start at various spots on the back of the leg bones.[10]

Some of them attach to a flat structure called the anterior aponeurosis.[10] In contrastothers connect to another similar structure called the posterior aponeurosis. This muscle helps us stand and walk.[10]

Tibialis anterior

The tibialis anterior muscle is the largest in the front part of the lower leg. It starts from the upper section of the shin bone (tibia) and extends downward toward the foot.

This muscle performs two main movements:

  • Dorsiflexion – lifting the foot upward toward the shin.
  • Inversion – turning the sole inward.

Although the tibialis anterior is a muscleit works closely with important foot and ankle bones such as the calcaneus (heel bone)talus (ankle bone)navicularcuneiform bonesand the first three metatarsals.[8][11] Togetherthey make smooth and controlled foot movement possible.

The tibialis anterior is vital for walkingrunningclimbing stairsand balance. It lifts the foot during movementsupports the natural archand helps reduce strain on the lower leg and foot.[8][12]

A strong tibialis anterior is crucial for maintaining healthy gait mechanicsfoot stabilityand preventing injuries. Weakness or injury in this muscle may cause issues such as foot dropshin painor walking instability.[8][12]

Peroneus Longus 

The peroneus longus is one of the two main muscles on the outer side of the lower legalong with the peroneus brevis. It is supplied with blood by the fibular artery and branches of the tibial artery. Its movements are controlled by the superficial fibular (peroneal) nervewhich comes from the spinal nerves L5–S2.[3][5]

This muscle begins at the upper and outer surface of the fibula (the long bone of the leg) and extends downward toward the foot. It attaches at the base of the first metatarsal and the medial cuneiform bone near the big toe.[3][5]

Key Functions of the Peroneus Longus

  • Plantarflexion – pointing the foot downward.
  • Eversion – turning the sole outward.
  • Arch support – helping stabilize the transverse arch of the foot.

This muscle works together with the peroneus brevis & ensures smooth foot movementsbalanceand stability during walkingrunningand side-to-side activities.[3][5]

The peroneus longus can be affected by:

  • Strains or tears – often from sudden twisting motions.
  • Tendonitis – inflammation caused by overuse or repetitive stress.
  • Ankle sprains – especially in sports like basketballfootballor running.

Symptoms may include pain in the outer ankleswellingweaknessor difficulty moving the foot.

Peroneus Brevis

The peroneus brevis is an important muscle on the outer side of the lower leg. It is located just beneath the peroneus longus.

Its main role is to help turn the foot outward (eversion) and point the toes downward (plantar flexion). These movements are essential for walkingrunningand keeping proper balance.[9][5]

This muscle gets its nerve supply from the superficial peroneal nerve and its blood supply from the peroneal artery.

It begins from the lower part of the fibula (the thin bone on the outside of the leg) and attaches to the base of the fifth metatarsal bone on the outer edge of the foot.[9][5]

Unlike the longer and slimmer peroneus longusthe peroneus brevis is shorter and thickerwhich makes it more stable. Its tendon runs slightly above the outer ankle bone (lateral malleolus)curves around the ankleand firmly attaches to the fifth metatarsal.

This strong attachment helps stabilize the ankle and protects it from common injuries such as ankle sprains.[9][5]

Detailed diagram of hip muscle anatomy showing major musclestheir nameslocationsand functions in human movement
Visual guide to the major muscles of the hiphighlighting their anatomical positions and roles in movement and stability.
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Leg Anatomy

Leg Muscles Anatomy

Start the Quiz on Leg Muscles Anatomy.

1 / 10

1.

Which muscle group is often responsible for “runners’ knee” due to overuse in the front thigh?

2 / 10

2.

Which muscle serves as a key stabilizer during side-stepping and hip abduction exercises?

3 / 10

3.

Which muscle is activated when you stand on tip-toes to reach something on a high shelf?

4 / 10

4.

Which muscle is known as the “tailor’s muscle” because of its longthin shape and diagonal course across the thigh?

5 / 10

5.

Which muscle group abducts the thigh (moves it away from the midline)?

6 / 10

6.

Which muscle attaches to the anterior superior iliac spineruns obliquely across thigh and helps flex the hip and flex the knee?

7 / 10

7.

Which muscle of the lower leg plays a vital role in controlling foot inversion and supports arch of the foot?

8 / 10

8.

To prevent “shin splints”it’s important to strengthen which muscle?

9 / 10

9.

Which muscle lies superficially on the medial thigh and assists in thigh adduction as well as knee flexion?

10 / 10

10.

Which muscle in the anterior thigh helps both to flex the hip and abduct/laterally rotate the thigh?

Your score is

The average score is 13%

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} /* Quiz textarea height */ #ays-quiz-container-12 textarea { height: 100px; min-height: 100px; } /* Quiz rate and passed users count */ #ays-quiz-container-12 .ays_quizn_ancnoxneri_qanak, #ays-quiz-container-12 .ays_quiz_rete_avg { color:#fff !important; background-color:#000000; } #ays-quiz-container-12 .ays-questions-container > .ays_quizn_ancnoxneri_qanak { padding: 5px 20px; } #ays-quiz-container-12 div.for_quiz_rate.ui.star.rating .icon { color: rgba(0,0,0,0.35); } #ays-quiz-container-12 .ays_quiz_rete_avg div.for_quiz_rate_avg.ui.star.rating .icon { color: rgba(255,255,255,0.5); } #ays-quiz-container-12 .ays_quiz_rete .ays-quiz-rate-link-box .ays-quiz-rate-link { color: #000000; } /* Loaders */ #ays-quiz-container-12 div.lds-spinner, #ays-quiz-container-12 div.lds-spinner2 { color: #000000; } #ays-quiz-container-12 div.lds-spinner div:after, #ays-quiz-container-12 div.lds-spinner2 div:after { background-color: #000000; } #ays-quiz-container-12 .lds-circle, #ays-quiz-container-12 .lds-facebook div, #ays-quiz-container-12 .lds-ellipsis div{ background: #000000; } #ays-quiz-container-12 .lds-ripple div{ border-color: #000000; } #ays-quiz-container-12 .lds-dual-ring::after, #ays-quiz-container-12 .lds-hourglass::after{ border-color: #000000 transparent #000000 transparent; } /* Stars */ #ays-quiz-container-12 .ui.rating .icon, #ays-quiz-container-12 .ui.rating .icon:before { font-family: Rating !important; } /* Progress bars */ #ays-quiz-container-12 #ays_finish_quiz_12 .ays-progress { border-color: rgba(0,0,0,0.8); } #ays-quiz-container-12 #ays_finish_quiz_12 .ays-progress-bg { background-color: rgba(0,0,0,0.3); } #ays-quiz-container-12 . { background-color: #dd3333; } #ays-quiz-container-12 . { background-color: #000000; } #ays-quiz-container-12 .ays-progress-value { color: #000000; text-align: center; } #ays-quiz-container-12 .ays-progress-bar { background-color: #dd3333; } #ays-quiz-container-12 .ays-question-counter .ays-live-bar-wrap { direction:ltr !important; } #ays-quiz-container-12 .ays-live-bar-fill{ color: #000000; border-bottom: 2px solid rgba(0,0,0,0.8); text-shadow: 0px 0px 5px #fff; } #ays-quiz-container-12 .ays-live-bar-fill.ays-live-fourth, #ays-quiz-container-12 .ays-live-bar-fill.ays-live-third, #ays-quiz-container-12 .ays-live-bar-fill.ays-live-second { text-shadow: unset; } #ays-quiz-container-12 .ays-live-bar-percent{ display:none; } #ays-quiz-container-12 #ays_finish_quiz_12 .ays_average { text-align: center; } /* MusicSound */ #ays-quiz-container-12 .ays_music_sound { color:rgb(0,0,0); } /* Dropdown questions scroll bar */ #ays-quiz-container-12 blockquote { border-left-color: #000000 !important; } /* Quiz Password */ #ays-quiz-container-12 .ays-start-page > input[id^='ays_quiz_password_val_'], #ays-quiz-container-12 .ays-quiz-password-toggle-visibility-box { width: 100%; } /* Question hint */ #ays-quiz-container-12 .ays_question_hint_container .ays_question_hint_text { background-color:#fff; box-shadow: 0 0 15px 3px rgba(201,201,201,0.6); max-width: 270px; } #ays-quiz-container-12 .ays_question_hint_container .ays_question_hint_text p { max-width: unset; } #ays-quiz-container-12 .ays-quiz-additonal-box { display: flex; justify-content: flex-end; align-items: center; position: relative; } #ays-quiz-container-12 .ays_questions_hint_max_width_class { max-width: 80%; } /* Information form */ #ays-quiz-container-12 .ays-form-title{ color:rgb(0,0,0); } /* Quiz timer */ #ays-quiz-container-12 div.ays-quiz-redirection-timer, #ays-quiz-container-12 div.ays-quiz-timer{ color: #000000; text-align: center; } #ays-quiz-container-12 div.ays-quiz-timer.ays-quiz-message-before-timer:before { font-weight: 500; } /* Quiz title / transformation */ #ays-quiz-container-12 .ays-fs-title{ text-transform: uppercase; font-size: 28px; text-align: center; text-shadow: none; } /* Quiz buttons */ #ays-quiz-container-12 .ays_arrow { color:#ffffff!important; } #ays-quiz-container-12 input#ays-submit, #ays-quiz-container-12 #ays_finish_quiz_12 .action-button, div#ays-quiz-container-12 #ays_finish_quiz_12 .action-button.ays_restart_button, #ays-quiz-container-12 + .ays-quiz-category-selective-main-container .ays-quiz-category-selective-restart-bttn, #ays-quiz-container-12 .ays-quiz-category-selective-submit-bttn { background: none; background-color: #dd3333; color:#ffffff; font-size: 18px; padding: 14px 36px; border-radius: 8px; height: auto; letter-spacing: 0; box-shadow: unset; width: auto; /* border: unset; */ min-height: unset; line-height: normal; text-shadow: unset; } #ays-quiz-container-12 input#ays-submit, #ays-quiz-container-12 #ays_finish_quiz_12 input.action-button, #ays-quiz-container-12 + .ays-quiz-category-selective-main-container .ays-quiz-category-selective-restart-bttn, #ays-quiz-container-12 .ays-quiz-category-selective-submit-bttn { } #ays-quiz-container-12 #ays_finish_quiz_12 .action-button.ays_check_answer { padding: 5px 10px; font-size: 18px !important; } #ays-quiz-container-12 #ays_finish_quiz_12 .action-button.ays_restart_button { white-space: nowrap; padding: 5px 10px; white-space: normal; } #ays-quiz-container-12 input#ays-submit:hover, #ays-quiz-container-12 input#ays-submit:focus, #ays-quiz-container-12 #ays_finish_quiz_12 .action-button:hover, #ays-quiz-container-12 #ays_finish_quiz_12 .action-button:focus, #ays-quiz-container-12 + .ays-quiz-category-selective-main-container .ays-quiz-category-selective-restart-bttn:hover, #ays-quiz-container-12 .ays-quiz-category-selective-submit-bttn:hover { background: none; box-shadow: 0 0 0 2px #ffffff; background-color: #dd3333; } #ays-quiz-container-12 .ays_restart_button { color: #ffffff; } #ays-quiz-container-12 .ays_restart_button_p, #ays-quiz-container-12 .ays_buttons_div { justify-content: center; } #ays-quiz-container-12 .ays_finish.action-button{ margin: 10px 5px; } #ays-quiz-container-12 .ays-share-btn.ays-share-btn-branded { color: #fff; display: inline-block; } #ays-quiz-container-12 .ays_quiz_results .ays-field.checked_answer_div.correct_div input:checked+label { background-color: transparent; } /* Question answers */ #ays-quiz-container-12 .ays-field { border-color: #dddddd; border-: solid; border-width: 1px; box-shadow: none;flex-direction: column-reverse; } /* Answer maximum length of a text field */ #ays-quiz-container-12 .ays_quiz_question_text_message{ color: #000000; text-align: left; font-size: 12px; } div#ays-quiz-container-12 div.ays_quiz_question_text_error_message { color: #ff0000; } /* Questions answer image */ #ays-quiz-container-12 .ays-answer-image { width:100%; height:150px; object-fit: cover; } #ays-quiz-container-12 .ays-quiz-answers .ays-field:hover:not(.ays-answered-text-input), #ays-quiz-container-12 .ays-quiz-answers .ays-field{ opacity: 1; } #ays-quiz-container-12.ays_quiz_elegant_light .ays-quiz-answers .ays-field:hover, #ays-quiz-container-12.ays_quiz_elegant_light .ays-quiz-answers .ays-field, #ays-quiz-container-12.ays_quiz_elegant_dark .ays-quiz-answers .ays-field:hover, #ays-quiz-container-12.ays_quiz_elegant_dark .ays-quiz-answers .ays-field{ opacity: 0.6; } #ays-quiz-container-12 #ays_finish_quiz_12 .ays-field label.ays_answer_caption[for^='ays-answer-'] { z-index: 1; position:initial;bottom:0;} #ays-quiz-container-12 #ays_finish_quiz_12 .ays-field input~label[for^='ays-answer-'] { padding: 5px; } #ays-quiz-container-12 #ays_finish_quiz_12 .ays-field { margin-bottom: 12px; } #ays-quiz-container-12 #ays_finish_quiz_12 .ays-field.ays_grid_view_item { width: calc(50% - 6px); } #ays-quiz-container-12 #ays_finish_quiz_12 .ays-field.ays_grid_view_item:nth-child(odd) { margin-right: 6px; } #ays-quiz-container-12 #ays_finish_quiz_12 .ays-field input:checked+label:before { border-color: #dd3333; background: #dd3333; background-clip: content-box; } #ays-quiz-container-12 .ays-quiz-answers div.ays-text-right-answer { color: #000000; } /* Questions answer right/wrong icons */ #ays-quiz-container-12 .ays-field input~label.answered.correct:after{ content: url('https://humanbodypartsanatomy.com/wp-content/plugins/quiz-maker/public/images/correct.png'); } #ays-quiz-container-12 .ays-field input~label.answered.wrong:after{ content: url('https://humanbodypartsanatomy.com/wp-content/plugins/quiz-maker/public/images/wrong.png'); } #ays-quiz-container-12 .ays-field label.answered:last-of-type:after{ display: none; height: auto; left: 10px;top: 10px;} /* Dropdown questions */ #ays-quiz-container-12 #ays_finish_quiz_12 .ays-field .select2-container--default .select2-selection--single { border-bottom: 2px solid #dd3333; background-color: #dd3333; } #ays-quiz-container-12 .ays-field .select2-container--default .select2-selection--single .select2-selection__placeholder, #ays-quiz-container-12 .ays-field .select2-container--default .select2-selection--single .select2-selection__rendered, #ays-quiz-container-12 .ays-field .select2-container--default .select2-selection--single .select2-selection__arrow { color: #ffffff; } #ays-quiz-container-12 .select2-container--default .select2-search--dropdown .select2-search__field:focus, #ays-quiz-container-12 .select2-container--default .select2-search--dropdown .select2-search__field { outline: unset; padding: 0.75rem; } #ays-quiz-container-12 .ays-field .select2-container--default .select2-selection--single .select2-selection__rendered, #ays-quiz-container-12 .select2-container--default .select2-results__option--highlighted[aria-selected] { background-color: #dd3333; } #ays-quiz-container-12 .ays-field .select2-container--default, #ays-quiz-container-12 .ays-field .select2-container--default .selection, #ays-quiz-container-12 .ays-field .select2-container--default .dropdown-wrapper, #ays-quiz-container-12 .ays-field .select2-container--default .select2-selection--single .select2-selection__rendered, #ays-quiz-container-12 .ays-field .select2-container--default .select2-selection--single .select2-selection__rendered .select2-selection__placeholder, #ays-quiz-container-12 .ays-field .select2-container--default .select2-selection--single .select2-selection__arrow, #ays-quiz-container-12 .ays-field .select2-container--default .select2-selection--single .select2-selection__arrow b[role='presentation'] { font-size: 16px !important; } #ays-quiz-container-12 .select2-container--default .select2-results__option { padding: 6px; } /* Dropdown questions scroll bar */ #ays-quiz-container-12 .select2-results__options::-webkit-scrollbar { width: 7px; } #ays-quiz-container-12 .select2-results__options::-webkit-scrollbar-track { background-color: rgba(255,255,255,0.35); } #ays-quiz-container-12 .select2-results__options::-webkit-scrollbar-thumb { transition: .3s ease-in-out; background-color: rgba(0,0,0,0.55); } #ays-quiz-container-12 .select2-results__options::-webkit-scrollbar-thumb:hover { transition: .3s ease-in-out; background-color: rgba(0,0,0,0.85); } /* Audio / Video */ #ays-quiz-container-12 .me-container .me-time{ box-sizing: unset; } #ays-quiz-container-12 .me-container .me-time-rail { padding-top: 15px; } #ays-quiz-container-12 .me-container .me-mediaelement video { margin: 0; } /* Limitation */ #ays-quiz-container-12 .ays-quiz-limitation-count-of-takers { padding: 50px; } #ays-quiz-container-12 div.ays-quiz-results-toggle-block span.ays-show-res-toggle.ays-res-toggle-show, #ays-quiz-container-12 div.ays-quiz-results-toggle-block span.ays-show-res-toggle.ays-res-toggle-hide{ color: #000000; } #ays-quiz-container-12 div.ays-quiz-results-toggle-block input:checked + label.ays_switch_toggle { border: 1px solid #000000; } #ays-quiz-container-12 div.ays-quiz-results-toggle-block input:checked + label.ays_switch_toggle { border: 1px solid #000000; } #ays-quiz-container-12 div.ays-quiz-results-toggle-block input:checked + label.ays_switch_toggle:after{ background: #000000; } #ays-quiz-container-12.ays_quiz_elegant_dark div.ays-quiz-results-toggle-block input:checked + label.ays_switch_toggle:after, #ays-quiz-container-12.ays_quiz_rect_dark div.ays-quiz-results-toggle-block input:checked + label.ays_switch_toggle:after{ background: #000; } /* Hestia theme (Version: 3.0.16) | Start */ #ays-quiz-container-12 .me-container .me-inner .me-controls .me-button > button:hover, #ays-quiz-container-12 .me-container .me-inner .me-controls .me-button > button { box-shadow: unset; background-color: transparent; } #ays-quiz-container-12 .me-container .me-inner .me-controls .me-button > button { margin: 10px 6px; } /* Hestia theme (Version: 3.0.16) | End */ /* Go theme (Version: 1.4.3) | Start */ #ays-quiz-container-12 label[for^='ays-answer']:before, #ays-quiz-container-12 label[for^='ays-answer']:before { -webkit-mask-image: unset; mask-image: unset; } #ays-quiz-container-12.ays_quiz_classic_light .ays-field input:checked+label.answered.correct:before, #ays-quiz-container-12.ays_quiz_classic_dark .ays-field input:checked+label.answered.correct:before { background-color: #dd3333 !important; background-color: rgba(39,174,961) !important; } /* Go theme (Version: 1.4.3) | End */ #ays-quiz-container-12 .ays_quiz_results fieldset.ays_fieldset .ays_quiz_question .wp-video { width: 100% !important; max-width: 100%; } /* Classic Dark / Classic Light */ /* Dropdown questions right/wrong s */ #ays-quiz-container-12.ays_quiz_classic_dark .correct_div, #ays-quiz-container-12.ays_quiz_classic_light .correct_div{ border-color:green !important; opacity: 1 !important; background-color: rgba(39,174,96,0.4) !important; } #ays-quiz-container-12.ays_quiz_classic_dark .correct_div .selected-field, #ays-quiz-container-12.ays_quiz_classic_light .correct_div .selected-field { padding: 0px 10px 0px 10px; color: green !important; } #ays-quiz-container-12.ays_quiz_classic_dark .wrong_div, #ays-quiz-container-12.ays_quiz_classic_light .wrong_div{ border-color:red !important; opacity: 1 !important; background-color: rgba(243,134,129,0.4) !important; } #ays-quiz-container-12.ays_quiz_classic_dark .ays-field.checked_answer_div.wrong_div input:checked~label, #ays-quiz-container-12.ays_quiz_classic_light .ays-field.checked_answer_div.wrong_div input:checked~label { background-color: rgba(243,134,129,0.4) !important; } #ays-quiz-container-12.ays_quiz_classic_dark .ays-field, #ays-quiz-container-12.ays_quiz_classic_light .ays-field { text-align: left; /*margin-bottom: 10px;*/ padding: 0; transition: .3s ease-in-out; } #ays-quiz-container-12 .ays-quiz-close-full-screen { fill: #000000; } #ays-quiz-container-12 .ays-quiz-open-full-screen { fill: #000000; } #ays-quiz-container-12 .ays_quiz_login_form p{ color: #000000; } /* report questions modal start */ .ays-modal-reports { display: none; position: fixed; z-index: 9999; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background-color: rgba(0000.4); animation-duration: .5s; background-color: rgba(0000.4); } #ays-quiz-question-report-modal-12 .ays-modal-content-reports { background-color: #fefefe; margin: 10% auto; border: 1px solid #888; max-width: 500px; width: 100%; border-radius: 10px; padding: 20px; box-sizing: border-box; position: relative; } #ays-quiz-question-report-modal-12 .ays-modal-content-reports label{ display: block; margin-bottom: 10px; font-weight: bold; letter-spacing: normal; } #ays-quiz-question-report-modal-12 .ays-modal-content-reports textarea { display: block; width: 100%; height: 100px; padding: 5px; box-sizing: border-box; border-radius: 5px; border: 1px solid #ccc; max-width: 100%; max-height: 500px; resize: vertical; transition: unset; } #ays-quiz-question-report-modal-12 .ays-modal-content-reports input.ays-quiz-submit-question-report { background-color: #0073aa; color: #fff !important; border: none; border-radius: 5px; padding: 10px 20px; cursor: pointer; margin-top: 20px; line-height: normal; letter-spacing: normal; box-shadow: unset; background-image: unset; } #ays-quiz-question-report-modal-12 .ays-close-reports-window { color: #aaa; font-weight: bold; position: absolute; top: 1%; right: 1%; } #ays-quiz-question-report-modal-12 .ays-close-reports-window img { box-shadow: unset; } #ays-quiz-question-report-modal-12 .ays-quiz-preloader img { box-shadow: unset; } #ays-quiz-question-report-modal-12 .ays-close-reports-window img:hover, #ays-quiz-question-report-modal-12 .ays-close-reports-window img:focus { cursor: pointer; } #ays-quiz-question-report-modal-12 .ays-quiz-question-report-error { display: none; font-size: 13px; color: #f00; text-align: left; } #ays-quiz-question-report-modal-12 .ays-quiz-question-report-textarea-label, #ays-quiz-question-report-modal-12 .ays-quiz-question-report-title { text-align: left; } #ays-quiz-question-report-modal-12 .ays_quiz_modal_overlay { width: 100%; height: 100%; position: fixed; top: 0; left: 0; position: absolute; z-index: 1000000000; flex-direction: column; } #ays-quiz-question-report-modal-12 .ays-quiz-container .ays-quiz-user-cհoosing-anonymous-assessment { margin: 10px 0; } /* report questions modal end */ @media screen and (max-width: 768px){ #ays-quiz-container-12{ max-width: 100%; } div#ays-quiz-container-12 [id^='ays_finish_quiz_'] div.step div.ays-abs-fs { width: 90%; } #ays-quiz-container-12 .ays_quiz_question p { font-size: 16px; } #ays-quiz-container-12 .select2-container, #ays-quiz-container-12 .ays-field * { font-size: 15px !important; } div#ays-quiz-container-12 input#ays-submit, div#ays-quiz-container-12 #ays_finish_quiz_12 .action-button, div#ays-quiz-container-12 #ays_finish_quiz_12 .action-button.ays_restart_button, #ays-quiz-container-12 + .ays-quiz-category-selective-main-container .ays-quiz-category-selective-restart-bttn, #ays-quiz-container-12 .ays-quiz-category-selective-submit-bttn { font-size: 18px; } /* Quiz title / mobile font size */ div#ays-quiz-container-12 .ays-fs-title { font-size: 20px; } /* Question explanation / mobile font size */ #ays-quiz-container-12 .ays_questtion_explanation p { font-size:16px; } /* Wrong answers / mobile font size */ #ays-quiz-container-12 .wrong_answer_text p { font-size:16px; } /* Right answers / mobile font size */ #ays-quiz-container-12 .right_answer_text p { font-size:16px; } /* Note text / mobile font size */ #ays-quiz-container-12 .ays-quiz-question-note-message-box p { font-size:14px; } div#ays-quiz-container-12 .ays-quiz-question-note-message-box *:not(strong) { text-transform:none; text-decoration: none; letter-spacing: 0px; font-weight: normal; } div#ays-quiz-container-12 .ays_questtion_explanation *:not(strong) { text-transform:none; text-decoration: none; letter-spacing: 0px; font-weight: normal; } div#ays-quiz-container-12 .right_answer_text *:not(strong) { text-transform:none; text-decoration: none; letter-spacing: 0px; font-weight: normal; } div#ays-quiz-container-12 .wrong_answer_text *:not(strong) { text-transform:none; text-decoration: none; letter-spacing: 0px; font-weight: normal; } } /* Custom css s */ /* RTL direction s */<>#ays-quiz-container-12 p { margin: 0.625em; } #ays-quiz-container-12 .ays-field.checked_answer_div input:checked~label { background-color: rgba(221,51,51,0.6); } #ays-quiz-container-12.ays_quiz_classic_light .ays_quiz_results .ays-field.checked_answer_div input:checked~label, #ays-quiz-container-12.ays_quiz_classic_dark .ays_quiz_results .ays-field.checked_answer_div input:checked~label, #ays-quiz-container-12.ays_quiz_classic_light .enable_correction .ays-field.checked_answer_div input:checked~label, #ays-quiz-container-12.ays_quiz_classic_dark .enable_correction .ays-field.checked_answer_div input:checked~label { background-color: transparent; } #ays-quiz-container-12.ays_quiz_classic_light .ays_quiz_results .not_influence_to_score .ays-field.checked_answer_div input:checked~label, #ays-quiz-container-12.ays_quiz_classic_dark .ays_quiz_results .not_influence_to_score .ays-field.checked_answer_div input:checked~label, #ays-quiz-container-12.ays_quiz_classic_light .enable_correction .not_influence_to_score .ays-field.checked_answer_div input:checked~label, #ays-quiz-container-12.ays_quiz_classic_dark .enable_correction .not_influence_to_score .ays-field.checked_answer_div input:checked~label { background-color: rgba(221,51,51,0.6); } #ays-quiz-container-12 #ays_finish_quiz_12 .action-button:hover, #ays-quiz-container-12 #ays_finish_quiz_12 .action-button:focus, #ays-quiz-container-12 + .ays-quiz-category-selective-main-container .ays-quiz-category-selective-restart-bttn:hover, #ays-quiz-container-12 .ays-quiz-category-selective-submit-bttn:focus { box-shadow: 0 0 0 2px white0 0 0 3px #dd3333; background: #dd3333; }

Leg Anatomy: Joint

Hip Joint

The hip joint is also known as a ball-and-socket joint. It has a “ball” at the top of the thigh bone (femur) that fits into a “socket” in the hip bone (acetabulum).[13]

This design allows the hip joint to move in many directions. It can bend and straighten (flexion and extension)rotate (internal and external rotation)and move sideways (abduction and adduction).

One of the primary functions of the hip joint is to support the body’s weight when standingwalkingor running. It also helps transfer force from your upper body to your legsallowing you to move.[13]

The hip joint is strong and stablepartly because of the deep socket that holds the femur in place. There is also a ring of tough cartilage called the acetabular labrum around the edge of the socketwhich helps keep the joint secure.[13]

This cartilage has a few important roles:

  • It helps spread the pressure when you put weight on your hips.
  • It creates a suction that helps keep the joint stablelike a vacuum seal.
  • It also helps control the fluid flow that lubricates the jointwhich keeps everything moving smoothly.
Detailed diagram of the human hip bone anatomy showing all partsincluding iliumischiumpubisacetabulumand sacroiliac joint with labeled names and functions.
Comprehensive hip bone anatomy showing key structures like iliumischiumand pubis with labeled functions.

Read More – Hip Bone Anatomy – Complete Guide with PartsNamesFunctions & Diagram

Knee Joint

The knee is the largest joint in our body. It mainly operates as a hinge for bending and straightening the leg. Its structure involves two key articulations: the tibiofemoral and patellofemoral jointswhich create a compound synovial joint together.[18][15]

This joint is essential for efficient walkingrunningand jumping. The bones involved in knee articulation are complex.

The femur has a slight inward slantwhile the tibia is almost vertical. The patellathe largest sesamoid bone in the bodysits at the front of the knee. It serves as the endpoint for the quadriceps tendon and shields the front surface of the femur.[18][15]

The articulating surfaces at the knee include the lateral and medial condyles of the femur and tibiaand the front-to-back connection between the patella and femur.[18]

Detailed labeled diagram of knee anatomy showing bonesligamentscartilagetendonsand muscles that support joint movement and stability.
Anatomy of the human knee joint with labeled partsincluding bonesligamentsand musclesthat enable movement and support body weight.

Read More – Knee Anatomy: Complete Guide to PartsNamesFunctions & Diagram

Ankle Joint

The ankle joint is formed by joining three bones: the talustibiaand fibula. It is a socket where the talus bone sitssurrounded by the tibia and fibula. The bony prominence on the lower fibulathe malleolihelps form the edges of this joint.[5][11]

During walkingthe ankle adjusts to different surfaces. It can move in four main ways: pushing your toes down (plantarflexion)pulling them up (dorsiflexion)tilting the sole of your foot inwards (inversion)or tilting it outwards (eversion).[5][11]

Subtalar Joint

The subtalar joint is also known as the talocalcaneal joint. It is where the talus bone and the calcaneus bone meet in the foot.

There are three points where they connecttwo in the front and one in the back. These connection points are called facetswith one at the backone in the middleand one in the front.[11]

At the front and middle connectionsthe shape of the talus fits into the shape of the calcaneuswith the talus being convex and the calcaneus being concave. In the back connectionthe talus is concaveand the calcaneus is convex.[11]

The middle connection has a structure called the sustentaculum tali as its floorand the front connection fits snugly against the head of the talus. 

Sometimesthe middle and front connections are combined into one. The back connection is the largest and is separated from the others by a tarsal canal structure.

This joint allows the foot to move from side to side (inversion and eversion). Howeverit does not have much to do with moving the foot up or down (dorsiflexion or plantarflexion).[11]

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Leg Anatomy

Leg Joints Anatomy

Start the Quiz on Leg Joints Anatomy.

1 / 10

1.

The ankle mortise is best described as:

2 / 10

2.

Which joint is stabilized by the cruciate and collateral ligaments as well as the menisci?

3 / 10

3.

A “high ankle sprain” refers to injury of which joint connection?

4 / 10

4.

Which joint is deepest and most enclosed by musculaturemaking imaging/injury assessment more challenging?

5 / 10

5.

Which joint’s dysfunction might lead to a “Trendelenburg sign” (pelvic drop on the opposite leg when standing on one leg)?

6 / 10

6.

A “meniscus tear” occurs in which joint?

7 / 10

7.

Which knee ligament prevents excessive forward sliding of the tibia relative to the femur?

8 / 10

8.

Which joint is a ball-and-socket joint that allows the greatest range of motion in the leg?

9 / 10

9.

Which joint involves the kneecap gliding over the femur’s trochlear groove?

10 / 10

10.

A subluxation or dislocation of the patella involves which joint?

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FAQ’s

1. What are the main parts of the human leg?

The human leg consists of bones (femurtibiafibulapatella)muscles (quadricepshamstringscalf musclestibialis anteriorperoneal musclesetc.)joints (hipkneeanklesubtalar)ligamentstendonsblood vesselsand nerves.[1][4][5][7][11]

2. How many bones are in the leg?

Each lower limb’s main long bones include the femurtibiafibulaand patellaplus numerous tarsalmetatarsaland phalangeal bones in the foot. The major weight-bearing leg bones are the femurtibiafibulaand patellareferenced above.[1][4][5]

3. Which muscles are found in the leg?

Major leg muscles include the quadriceps and hamstrings in the thighand the calf muscles (gastrocnemius and soleus)tibialis anterior in the anterior compartmentand the peroneal (fibularis) muscles in the lateral compartment; additional deeper muscles control toe and foot movements.[7][6][8][9]

4. Why is the tibia called the “shin bone”?

The tibia is commonly called the shin bone because it forms the front portion of the lower leg. It bears most of the body’s weight and connects the knee to the ankle.[4]

5. What is the difference between the tibia and fibula?

The tibia is largerweight-bearingand forms the shin. The fibula is thinnerlies beside the tibiaand provides stability to the ankle but does not bear much weight.[4][5]

6. Which nerves control the leg muscles?

The sciatic nerve is the largest nerve supplying the leg. It branches into the tibial and common peroneal nerveswhich control movement and sensation in the thighcalfand foot.[14][20]

7. Why are the leg muscles important for balance?

Leg muscles (quadricepshamstringscalvesglutealsand intrinsic foot muscles) stabilize joints and coordinate movements that maintain posture and enable safebalanced gait and stance.[6][11][20]

References-

  1. Berry Ket al. (2024). AnatomyBony Pelvis and Lower Limb: Leg Bones. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK537024/
  2. Berry Ket al. (2023). AnatomyBony Pelvis and Lower Limb: Femur. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK532982/
  3. Lezak BVaracallo M. (2023). AnatomyBony Pelvis and Lower Limb: Calf Peroneus Longus Muscle. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK546650/
  4. Johnson ECet al. (2023). AnatomyBony Pelvis and Lower Limb: Tibia. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK526053/
  5. Gupton Met al. (2023). AnatomyBony Pelvis and Lower Limb: Fibula. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK470591/
  6. Bordoni Bet al. (2023). AnatomyBony Pelvis and Lower Limb: Gastrocnemius Muscle. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK532946/
  7. Berry Ket al. (2022). AnatomyBony Pelvis and Lower Limb: Thigh Muscles. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK482445/
  8. Juneja Pet al. (2023). AnatomyBony Pelvis and Lower Limb: Tibialis Anterior Muscle. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK513304/
  9. Khawaji MTet al. (2023). AnatomyBony Pelvis and Lower Limb: Foot Peroneus Brevis Muscle. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK535427/
  10. Binstead JTet al. (2023). AnatomyBony Pelvis and Lower Limb: Calf. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK459362/
  11. Manganaro Det al. (2023). AnatomyBony Pelvis and Lower LimbFoot Joints. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK536941/
  12. Juneja PHubbard J. (2023). AnatomyBony Pelvis and Lower Limb: Tibialis Anterior Muscles. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK513304/
  13. Gold Met al. (2023). AnatomyBony Pelvis and Lower LimbHip Joint. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK470555/
  14. Machi Met al. (2023). AnatomySciatic Nerve. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK482431/
  15. Cleveland Clinic Medical Education Team. (2022). Femur (Thighbone): AnatomyFunction & Common Conditions. Cleveland Clinic. https://my.clevelandclinic.org/health/body/22503-femur
  16. Berry KVaracallo M. (2023). AnatomyBony Pelvis and Lower LimbKneePatella. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK519534/
  17. Tetsworth Ket al. (2017). Gender-related differences in lower limb alignmentrange of joint motionand the incidence of sports injuries in Japanese university athletes. Knee Surg Sports Traumatol Arthrosc. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC5300795/
  18. Berry Ket al. (2023). AnatomyBony Pelvis and Lower LimbKnee. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK500017/
  19. Lovejoy COSuwa MSpurlock Let al. (2009). Fossilsfeetand the evolution of human bipedal locomotion. J Anat. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC1571304/
  20. Varacallo Met al. (2023). AnatomyBony Pelvis and Lower Limb: Nerves. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK532304/

Read More-

Lower Limb

Upper Limb

Official websites of the United States government.

Authors

Wojciech Pawlina MD – Human Anatomy Education Jeffrey T Laitman PhD – Anatomy & Physiology Lynda F. Bonewald PhD – Bone Biology and Remodeling

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All content on HumanBodyPartsAnatomy.com is educational and based on verifiedpeer-reviewed medical sources. Articles are authored or reviewed by qualified medical or biomedical professionals to ensure accuracy.

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