Typically, they develop on the last vertebra of the neck (the seventh cervical vertebra), above the typical first rib. They are called cervical ribs, and they usually develop in pairs, although ...

Each vertebra is numbered and grouped into 5 regions. Diagram. There are 7 cervical vertebrae in the cervical region. There are 12 thoracic vertebrae in the thoracic region. There are 5 lumbar ...