<P> In anatomy, the atlas (C1) is the most superior (first) cervical vertebra of the spine . </P> <P> It is named for the Atlas of Greek mythology, because it supports the globe of the head . </P> <P> The atlas is the topmost vertebra and with the axis forms the joint connecting the skull and spine . The atlas and axis are specialized to allow a greater range of motion than normal vertebrae . They are responsible for the nodding and rotation movements of the head . </P> <P> The atlanto - occipital joint allows the head to nod up and down on the vertebral column . The dens acts as a pivot that allows the atlas and attached head to rotate on the axis, side to side . </P>

What bone allows the head to nod yes