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The pelvic bone (os coxae) in adults looks like a whole bone. Up to 16 years old, it consists of three separate bones: the iliac, sciatic and pubic. The bodies of these bones on the outer surface form the acetabulum, which serves as the junction of the pelvic bone with the femur (Fig. 46).

Fig. 46.

Pelvic bone, right


A - view from the lateral side: 1 - iliac crest; 2 - inner lip; 3 - an intermediate line; 4 - outer lip; 5 - upper anterior iliac spine; b — lower anterior iliac spine; 7 - oververt-pit groove; 8 - the body of the ilium; 9 - the edge of the acetabulum; 10 - semilunar surface; 11 - fossa of the acetabulum; 12 - excision of the acetabulum; 13 - acetabulum; 14 - a locking hole; 15 - ischial tubercle; 16 - ischial spine; 17 — back gluteal line; 18 - lower posterior iliac spine; 19 - upper posterior iliac spine; 20 - ilium; 21 - lower gluteal line; 22 — gluteal surface; 23 - the ilium wing; 24 - front gluteal line; 25 - ileal tubercle; B - view from the medial side: 1 - iliac crest; 2 - upper posterior iliac spine; 3 - sacro-pelvic surface; 4 - iliac tuberosity; 5 - lower posterior iliac spine; 6 - an ear-shaped surface; 7 — locking hole; 8 - arcuate line; 9 - the lower anterior iliac spine; 10 - the body of the ilium; 11 - the ilium; 12 - upper anterior iliac spine; 13 - iliac fossa; 14 - the wing of the ilium; 15 - inner lip

The ilium (os ilium) is the largest, occupying the upper-posterior parts of the pelvic bone.
It consists of two sections - the body and the ilium wing. The upper curved edge of the wing is called the iliac crest. In front of the iliac crest there are two protrusions - the upper and lower anterior iliac spines, and below - the large sciatic notch. The inner concave surface of the wing forms the iliac fossa, and the outer convex - gluteal surface. On the inner surface of the wing are the ear-shaped surface - the place where the pelvic bone and the sacrum join.

The ischium (os ischii) consists of a body and a branch. Here are the sciatic tubercle and sciatic spine, as well as large and small sciatic notches. The ischium branch, fused in front with the lower branch of the pubic bone, closes the obstructive opening of the pelvic bone in this way.

The pubic bone (os pubis) has a body, upper and lower branches. At the junction of the bodies of the pubic and iliac bones is the iliac-pubic elevation. And at the junction of the upper branch to the lower, in the area of ​​the medial surface, there is a symphysial surface - the junction of the pelvic bones in front.

The acetabulum is formed by the fused bodies of the ilium, sciatic and pubic bones. Its articular semilunar surface occupies the peripheral part of the cavity.
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