The cervical spine comprises of the first 7 vertebrae, which form the neck. It is highly mobile compared to the thoracic or lumbar spine. In contrast to other parts of the spine, the cervical spine has transverse foramina in each vertebra through which the vertebral arteries supply blood to the brain. Based on the structural diversity in the cervical spine, it can be divided into two parts: the upper and lower cervical spine. The upper cervical spine comprises of the atlas (C1) and axis (C2), which are different from rest of the cervical vertebrae (C3-C7) which form the lower cervical spine.