Pelvic Bone, Male
A bony structure located at the bottom of the spine. The human sacrum forms the back part of the pelvis, is roughly triangular in shape, consists of five united vertebrae, and from its solidity it is well adapted to serve as the keystone of the pelvic arch.
GalleriesHuman Skeletal System
Logan Marshall, Ed. International Self-Pronouncing Reference Library (five vols.) (Philadelphia, PA: International Press, 1911)