part of part of Homo sapiens fused sacrum sacral tuberosity of sacrum 2026-03-19T00:00:00Z A skeletal element projection forming a rough, irregular eminence on the lateral aspect of the posterior sacral surface, superior to the auricular surface, that provides attachment for the interosseous and posterior sacroiliac ligaments binding the sacrum to the ilium. skeletal element projection David Osumi-Sutherland