Dens axis
Dens axis
- Synonym: Odontoid process
- Related terms: Dens of axis; Dens of axis (Axis [C II])
Definition
The dens of axis or odontoid process exhibits a slight constriction or neck, where it joins the body. On its anterior surface is an oval or nearly circular facet for articulation with that on the anterior arch of the atlas. On the back of the neck, and frequently extending on to its lateral surfaces, is a shallow groove for the transverse atlantal ligament which retains the process in position.