Which region of the vertebral column contains the axis?

The axis is a key component of the cervical region of the vertebral column. Specifically, it is the second cervical vertebra, known as C2. The axis plays a critical role in the rotational movement of the head, allowing for the "no" motion. It has a unique anatomical feature called the odontoid process, or dens, which protrudes upward and fits into the atlas (the first cervical vertebra, C1), enabling the rotation of the head around it.

Understanding the structure and function of the axis is essential for grasping how the cervical vertebrae facilitate movement and support in the neck area. The cervical region as a whole comprises seven vertebrae (C1 to C7), with the first two (atlas and axis) often referred to together due to their distinctive and functional significance in supporting the skull and allowing for head movement.