part of part of Homo sapiens thoracic vertebra 3 zone of bone organ transverse costal facet of third thoracic vertebra 2026-03-19T00:00:00Z A zone of bone organ located on the anterior surface of the transverse process of the third thoracic vertebra, articulating with the tubercle of the third rib at the costotransverse joint. It forms one component of the paired costovertebral articulations that stabilize and guide rib movement during respiration. David Osumi-Sutherland