Part of the Human Pelvic Bone

The Os Innominatum, or nameless bone, so called from bearing no resemblance to any known object, is a large irregular shaped bone, which, with its fellow of opposite side, forms the sides and front wall of the pelvic cavity. Labels: R, O, crest of ilium, just below O is seen the anterior superior spinous process; J, tuberosity of ischium; t, part of pubes, between J and T is seen the thyroid foramen: H, acetabulum, below H is seen end of ubic bone which, with its fellow of opposite side, forms the symphysis pubis.

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