Occipital condyle

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Structures seen on the posterior and lateral views of the skull.

The occipital condyles form part of the occipital bone in the cranium. They are kidney-shaped prominences that emerge from the underside of the occipital bone. 

The anterior extremities of the occipital condyles are directed forwards and medially. Their anterior parts are closer together than their posterior counterparts that encroach on the basilar part of the bone. The posterior extremities of the condyles extend back to the middle level of the foramen magnum.
The articular surfaces of the condyles slope downward and laterally. Near the base of each condylethere is a short tunnel-like canal called the hypoglossal canal.

These condyles importantly articulate with the first cervical vertebrae that is also known as the atlas. This forms the atlanto-occipital joint. The capsules of the atlanto-occipital joints attach to the margins of the condyles. These capsules  aid the stability of the joint. On the medial side of each condylethere is a rough impression or tubercle for the attachment of alar ligament. 

These condyles can fractureeither in isolation  or as part of a more extensive basilar skull fracture. When the fracture occurs independentlyit is categorized as a craniocervical injury. The symptoms of this fracture are similar to other craniocervical injuries. These patients present with high cervical painlimited neck movementabnormal head/neck positionprevertebral swellingand potential deficits in cranial nerves IXXXIand XII. The cranial nerve deficits are particularly characteristic due to the fracture's proximity to the jugular foramen and hypoglossal canal.