Vertebra

A vertebra (plural: vertebrae) is one of the 33 bones that collectively form the vertebral column. The vertebrae support the body and provide the protective bony corridor through which the spinal cord passes.

Vertebrae are defined by regions. Cervical vertebrae are those in the neck area. The dorsal vertebrae range from the bottom of the neck to the top of the pelvis. Dorsal vertebrae attached to ribs are called thoracic vertebrae, while those without ribs are called lumbar vertebrae. The sacral vertebrae are those in the pelvic region.