The human spine normally consists of 33 vertebrae in total. These vertebrae are divided into regions as follows:

• Cervical spine: 7 vertebrae
• Thoracic spine: 12 vertebrae
• Lumbar spine: 5 vertebrae
• Sacral spine: 5 fused vertebrae forming the sacrum
• Coccygeal spine: 4 fused vertebrae forming the coccyx (tailbone)

Excluding rare variations, the total number of vertebrae ranges from 32 to 35 in most people.