Ilium
- The ilium has a broad wing and a body that contributes to the acetabulum.
- The iliac crest runs between the anterior and posterior superior iliac spines.
- The anterior superior iliac spine anchors the inguinal ligament and sartorius.
- The anterior inferior iliac spine gives origin to rectus femoris.
- The iliac crest and iliac spines are palpable bony landmarks that serve as attachment points for ligaments and muscles crossing the hip and thigh.
- The posterior iliac spines anchor gluteal and sacroiliac ligaments.
- The iliac fossa on the medial surface gives origin to iliacus.
- The auricular surface articulates with the sacrum.
- Posterior, anterior, and inferior gluteal lines define gluteal-muscle attachment areas.
- A fossa is a shallow depression, an auricular surface is an ear-shaped joint surface for the sacrum, and gluteal lines mark where gluteal muscles attach to the outer ilium.
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