part of part of Homo sapiens zone of bone organ thoracic vertebra 8 transverse costal facet of eighth thoracic vertebra 2026-03-19T00:00:00Z A zone of bone organ located on the anterior surface of the transverse process of the eighth thoracic vertebra, articulating with the tubercle of the eighth rib at the costotransverse joint. The transverse processes are progressively shorter and more posteriorly directed at this level, and the facet is correspondingly reduced compared to those of upper thoracic vertebrae. David Osumi-Sutherland