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| | II. Osteology. 6c. The Bones of the Lower Extremity. 1. The Hip Bone. Gray, Henry. 1918. Anatomy of the Human Body. |
 | | The ischium is the lowest and strongest portion of the bone; it proceeds downward from the acetabulum, expands into a large tuberosity, and then, curving forward, forms, with the pubis, a large aperture, the obturator foramen. |
 | | At birth, the three primary centers are quite separate, the crest, the bottom of the acetabulum, the ischial tuberosity, and the inferior rami of the ischium and pubis being still cartilaginous. |
 | | Below, it is continuous with the pelvic surfaces of the ischium and pubis, only a faint line indicating the place of union. |
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