(lower back): 5 vertebrae (L1-L5)
* Sacrum (pelvis region): 5 (fused) vertebrae (S1-S5)
* Coccyx (tailbone): 4 (3-5, fused) vertebrae

Combined vertebral regions

For some medical purposes, adjacent vertebral regions may be considered together:
* Cervicothoracic spine (or region or division): the combined region of the cervical vertebrae and the thoracic vertebrae

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