part of part of Homo sapiens innominate bone zone of bone organ ischial body of ischium of os coxa 2026-03-19T00:00:00Z A zone of bone organ forming the thick, upper part of the ischium of the os coxa (innominate bone), contributing the posteroinferior portion of the acetabulum superiorly and bearing the ischial spine posteriorly, and providing attachment for several hip muscles and ligaments. David Osumi-Sutherland