The cranial bone that articulates with the atlas is the c) sphenoid occipital bone.
- The occipital bone connects to the temporals, sphenoid, parietals, and the atlas, the top vertebra, in the back of the skull.
- There are two concave facets on the atlas bone's superior surface. The occipital bone of the skull's underside has rounded condyles that connect to the facets.
- The head is free to nod up and down at this intersection. The axis bone sits just beneath the atlas bone.
- The synovial articulation between the first cervical vertebra and the occipital bone is known as the atlantooccipital joint (atlas).
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