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Sacropelvic Surface of Ilium
Skeletal System

Sacropelvic Surface of Ilium

Facies sacropelvica ossis ilium

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The sacropelvic surface of ilium is the rough, irregularly shaped area of the inner aspect of the ilium. It is one of the three surfaces of the ilium, the other two being the iliac fossa and the gluteal surface of ilium, and is an area that is bounded:

- anteriorly, by the medial border of ilium;

- posteriorly, by the posterior border of ilium;

- superiorly, by the iliac crest.

The sacropelvic surface of ilium is continuous inferiorly with the pelvic surfaces of both the body of ischium and superior pubic ramus. It consists of two sacral and pelvic portions, where:

- the sacral portion is the posterosuperiorly located portion that consists of the iliac tuberosity and the auricular surface of ilium;

- the pelvic portion is the anteroinferiorly located portion that provides an origin site for the obturator internus muscle and an attachment site for the anterior sacroiliac ligament.

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