Cervical: 7 vertebrae (C1 = highest; C7 = lowest)
Thoracic: 12 vertebrae (T1 = highest; T12 = lowest)
Lumbar: 5 vertebrae (L1 = highest; L5 = lowest)
Sacral: 5 fused vertebrae (S1 = highest; S5 = lowest)
Coccygeal: 3-4 fused vertebrae (Co1 = highest; Co3 = lowest)