part of part of Homo sapiens thoracic vertebra 1 zone of bone organ superior articular facet of first thoracic vertebra 2026-03-19T00:00:00Z A zone of bone organ located on the superior articular process of the first thoracic vertebra, facing posteriorly and slightly superiorly. It articulates with the inferior articular facet of C7 at the cervicothoracic junction, where facet orientation transitions from the more horizontal cervical pattern to the coronal thoracic pattern. David Osumi-Sutherland