part of part of Homo sapiens zone of bone organ rib 8 sternal end of eighth rib 2026-03-19T00:00:00Z A zone of bone organ forming the anterior extremity of the eighth rib, which connects to the costal cartilage of the eighth rib. The costal cartilage of the eighth rib does not attach directly to the sternum but joins the cartilage of the seventh rib, making the eighth rib a false rib. David Osumi-Sutherland