Structure C is the:

Structure C is the:

• A. Body of sphenoid
• B. Occipital bone
• C. Dorsum sellae
• D. Anterior clinoid process

Answer: (B)

This item tests your ability to identify skull bones by their location. Structure C is the occipital bone because it forms the back and lower part of the cranium, including the posterior base where the foramen magnum sits and where the occipital condyles articulate with the atlas. The other possibilities are parts of the sphenoid bone: the body of the sphenoid is the central portion within the skull base, the dorsum sellae is the bony ridge forming the posterior boundary of the sella turcica, and the anterior clinoid processes are projections from the sphenoid near the optic canals. If Structure C is in the posterior base region, that identifies it as the occipital bone.

This item tests your ability to identify skull bones by their location. Structure C is the occipital bone because it forms the back and lower part of the cranium, including the posterior base where the foramen magnum sits and where the occipital condyles articulate with the atlas. The other possibilities are parts of the sphenoid bone: the body of the sphenoid is the central portion within the skull base, the dorsum sellae is the bony ridge forming the posterior boundary of the sella turcica, and the anterior clinoid processes are projections from the sphenoid near the optic canals. If Structure C is in the posterior base region, that identifies it as the occipital bone.