part of part of Homo sapiens thoracic vertebra 9 zone of bone organ inferior articular facet of ninth thoracic vertebra 2026-03-19T00:00:00Z A zone of bone organ located on the inferior articular process of the ninth thoracic vertebra, facing anteroinferiorly and oriented in the coronal plane. It articulates with the superior articular facet of T10, forming the zygapophyseal joint at the transitional zone where thoracic facet orientation begins to shift toward the lumbar sagittal pattern. David Osumi-Sutherland