Hip bone (medial view) (English)

The internal surface of the iliac ala/wing features the large, concave iliac fossa which provides attachment for the iliacus muscle. It is limited inferiorly by the arcuate line, which contributes to the pelvic inlet/superior pelvic aperture. Also visible is the medially facing sacropelvic surface of ilium, which bears the iliac tuberosity as well as an ear-shaped auricular surface for articulation with the sacrum at the sacroiliac joint. The greater sciatic notch is found along the posterior border of the ilium and ischium. Moving inferiorly, the lesser sciatic notch can be identified between the ischial spine and tuberosity. The pubis is located anteriorly; its superior ramus extends laterally to meet the ilium at the iliopubic eminence. The medial, oval-shaped symphyseal surface of the pubis is separated from its contralateral fellow by an interpubic disc, forming the pubic symphysis.