Posterior inferior iliac spine

Definition

The posterior inferior iliac spine is a bony projection located on the back of the ilium, one of the three bones that make up each side of the pelvis. It serves as an attachment point for ligaments and muscles, including those involved in hip movement.

Related terms

Ilium:

The largest bone of the pelvis, forming its uppermost part and providing support for bodily structures above and attachment points for muscles below.

Sacroiliac Joint:

A joint in the human body between the sacrum and ilium of the pelvis, which acts as a shock absorber and allows limited movement.

Ischial Spine:

A pointed projection located on the ischium, one of the three bones making up each side of the pelvis, serving as an attachment point for pelvic muscles and ligaments