part of part of Homo sapiens thoracic vertebra 5 zone of bone organ transverse costal facet of fifth thoracic vertebra 2026-03-19T00:00:00Z A zone of bone organ located on the anterior surface of the transverse process of the fifth thoracic vertebra, articulating with the tubercle of the fifth rib at the costotransverse joint. As thoracic vertebrae descend, the transverse process shortens and its costal facet becomes relatively smaller, though it remains distinct at T5. David Osumi-Sutherland