The document discusses the anatomy of the pelvis and pelvic girdle in humans. It describes how the pelvis is formed from three bones on each side—the ilium, ischium, and pubis—that fuse together in adults. It also mentions how the sacrum fits between the two hip bones to complete the pelvic ring and provides attachments for muscles. The pelvis connects the spine to the lower limbs and allows for weight distribution and locomotion.