part of part of Homo sapiens innominate bone iliac tubercle of ilium of os coxa 2026-03-19T00:00:00Z A skeletal element projection forming a thickened prominence on the outer lip of the iliac crest of the ilium of the os coxa (innominate bone), situated approximately five centimetres posterior to the anterior superior iliac spine and serving as a palpable landmark used in clinical procedures such as lumbar puncture positioning. skeletal element projection David Osumi-Sutherland