The coccyx is formed from how many fused vertebrae?

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

Answer: (D)

The tail end of the spine becomes a single bone through the fusion of the coccygeal vertebrae. In adults, a small group of these vertebrae in that region fuse to form one coccyx. The standard anatomy description uses four fused segments to make up the coccyx, though there can be some variation in rare individuals. This is why the commonly accepted answer is the four fused vertebrae, as it reflects the typical configuration taught in anatomy.