part of part of Homo sapiens tetrapod parietal bone surface groove groove for superior sagittal sinus of parietal bone 2026-03-19T00:00:00Z A surface groove running along the sagittal margin on the internal surface of the parietal bone, lodging the superior sagittal sinus as it courses posteriorly toward the confluence of sinuses at the internal occipital protuberance. David Osumi-Sutherland