part of part of Homo sapiens innominate bone surface groove obturator groove of pubis of os coxa 2026-03-19T00:00:00Z A surface groove forming the oblique channel running along the inferior surface of the superior pubic ramus of the pubis of the os coxa (innominate bone), roofed by the obturator membrane to form the obturator canal through which the obturator nerve and vessels pass from the pelvis to the thigh. David Osumi-Sutherland