How many movable vertebrae are in the human vertebral column?

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Front and back views of the human skeleton are shown side by side, with labeled bones including the skull, spine, ribs, pelvis, arms, legs, hands, and feet. Insets detail the bones of the foot and hand, highlighting major bone groups and anatomical terms. — human skeleton Front and back views of the human skeleton.

The human vertebral column contains 24 movable vertebrae. These are categorized into three distinct regions:

Cervical vertebrae: 7 bones located in the neck.1
Thoracic vertebrae: 12 bones located in the chest that articulate with the ribs.1
Lumbar vertebrae: 5 robust bones located in the lower back.1

The remaining vertebrae in the human spine—the 5 sacral vertebrae and the 3 to 5 caudal vertebrae (which form the coccyx)—are fused and therefore not considered movable.1