Name the two smooth rounded protebeses …

Markings of the Axis Bone:

1. Body or centrum (Corpus vertebrae) is a cylindrical mass on anterior side of the vertebra. It articulates with body of the vertebra below (C3).
2. Odontoid process or dens (Dens axis) is a prominent rounded superior projection from the body.
   This tooth-like elevation serves a stable point around which the atlas bone rotates (Gr., odous, tooth).
3. Superior articular facet (Facies articularis superior) is a smooth, sightly convex surface that articulates with the inferior articular facet on the altas bone above (C1)

The atlas is the first cervical vertebra and articulates with the occiput of the head and the axis (C2). It differs from the other cervical vertebrae in that it has no vertebral body and no spinous process. Instead, the atlas has lateral masses which are connected by an anterior and posterior arch.