Axis

Definition

In the context of anatomy and physiology, specifically when discussing the axial skeleton and the vertebral column, the axis refers to the second cervical vertebra (C2) of the spine. It is unique for its odontoid process, known as the dens, which allows for rotation of the head.

Related terms

Cervical Vertebrae: The seven vertebrae in the neck region that make up the upper part of the spinal column.

Odontoid Process: A tooth-like projection of the axis (C2 vertebra) around which the atlas (C1 vertebra) rotates.

Axial Skeleton: The central core of bones comprising the skull, vertebrae, ribs, and sternum