Simple up and down movement of the head (the "yes" motion) occurs primarily at the joint(s) between
A. the sphenoid bone and the occipital bone.
B. the occipital bone and the first cervical vertebra.
C. the first and second cervical vertebrae.
D. all of the cervical vertebrae in combination.
Answer: B. the occipital bone and the first cervical vertebra.
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