part of part of Homo sapiens thoracic vertebra 1 zone of bone organ inferior articular facet of first thoracic vertebra 2026-03-19T00:00:00Z A zone of bone organ located on the inferior articular process of the first thoracic vertebra, facing anteroinferiorly and articulating with the superior articular facet of T2. It is oriented in the coronal plane, characteristic of thoracic vertebrae, constraining rotation and contributing to zygapophyseal joint formation between T1 and T2. David Osumi-Sutherland