part of part of Homo sapiens rib 4 non-articular facet of tubercle of fourth rib 2026-03-19T00:00:00Z A skeletal element projection forming the rough, lateral portion of the tubercle of the fourth rib that anchors the lateral costotransverse ligament. It lies adjacent to but distinct from the smooth articular facet and is directed posteriorly toward the transverse process of the fourth thoracic vertebra. skeletal element projection David Osumi-Sutherland