part of part of Homo sapiens occipital bone internal occipital protuberance of squamous part of occipital bone 2026-03-19T00:00:00Z A skeletal element projection on the internal surface of the squamous occipital bone at the center of the cruciform eminence, marking the confluence of sinuses where the superior sagittal, straight, and occipital sinuses meet. skeletal element projection David Osumi-Sutherland