The coccygeal spine consists of how many fused vertebrae?

• A. Three fused vertebrae
• B. Two fused vertebrae
• C. Four fused vertebrae
• D. Five fused vertebrae

Answer: (C)

The coccygeal spine is the tail end of the vertebral column and is formed by coccygeal vertebrae that fuse together. In adults, these typically fuse into a single bone, most commonly from four vertebrae. While there can be natural variation where some individuals have three or five fused coccygeal vertebrae, the standard description taught for anatomy and exams is four fused vertebrae. That’s why describing the coccyx as four fused vertebrae is the best answer.