Fig. 1: Sagittal view of the cervical spine. (larger view). The cervical spine is comprised of seven vertebrae-C1, C2, C3, C4, C5, C6, C7 (often noted as C1-C7) - that begin at the base of the skull and extend down to the thoracic spine. Unlike the first two cervical vertebrae, the remaining five cervical vertebrae, C3 through C7, are constructed more similarly to the rest of the spine, with three joints making up each vertebral segment (a disc in the front and two facets joints in the back).