one. At their point of junction is the cavity of the acetabulum for articulation with the head of the femur or thigh bone.
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Fig. 63.—The right innominate bone. (After Toldt.)
The upper, expanded portion of the os innominatum is the ilium, whose upper border is known as the crest and which has two spinous processes front and back, a superior and an inferior, the superior spine being in each case the larger. These spines, especially the anterior superior spines, and the crest give attachment to many muscles, and to the outer surface of the bone the gluteal muscles are attached. The anterior superior spine is also important in making measurements to ascertain whether both legs are of equal length.
Below the ilium posteriorly is the body of the isch-*
