part of part of Homo sapiens rib 7 zone of bone organ sternal end of seventh rib 2026-03-19T00:00:00Z A zone of bone organ forming the anterior extremity of the seventh rib that connects to its costal cartilage. The seventh rib is the lowest true rib, and its costal cartilage typically articulates directly with the inferior end of the body of the sternum at or near the xiphosternal junction. David Osumi-Sutherland