In human anatomy, how many vertebrae are typically present in the adult spine?

In human anatomy, how many vertebrae are typically present in the adult spine?

• A. 26
• B. 30
• C. 33
• D. 40

Answer: (C)

The adult spine has 33 vertebrae when counting all vertebral segments. This includes 7 cervical, 12 thoracic, 5 lumbar, plus the sacrum formed by 5 fused vertebrae and the coccyx formed by 4 fused vertebrae. Even though the sacral and coccygeal bones are fused, they originate from multiple vertebrae, so the total count remains 33. (If you only count movable vertebrae, there are 24.)

The adult spine has 33 vertebrae when counting all vertebral segments. This includes 7 cervical, 12 thoracic, 5 lumbar, plus the sacrum formed by 5 fused vertebrae and the coccyx formed by 4 fused vertebrae. Even though the sacral and coccygeal bones are fused, they originate from multiple vertebrae, so the total count remains 33. (If you only count movable vertebrae, there are 24.)