KERMOAL / BSIP / SCIENCE PHOTO LIBRARY KERMOAL / BSIP / SCIENCE PHOTO LIBRARY
Sacrum and coccyx. Artwork of a frontal view of the sacrum and the coccyx (bottom centre), the two structures at the base of the vertebral column. Both structures consist of fused vertebrae, the outline of which can still be seen. The sacrum is five fused vertebrae, and the coccyx is usually (as here) four. Holes in the sacrum allow spinal nerves descending from the spinal cord to branch out to the legs.
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