The dens is part of the second cervical vertebra also called the axis. It serves as the central point around which the atlas rotates, allowing the head to move from side to side. The dens is the most cranial and prominent part of the axis and arises from the body of the axis, separating it from the vertebral arch. The dens also serves as a crucial component of the upper cervical spine, supporting the movement of the head and neck. It is essential for everyday activities such as swallowing and chewing.The dens is a unique and vital component of the cervical spine, contributing to the structure and function of the spine as well as the movement of the head and neck. The dens and atlas work together to provide stability to the skull and allow for the free movement of the head and neck.