Inferior Articular Facet Of The Thoracic Vertebra, Anatomy

Description

Inferior articular facet of a thoracic vertebra occupies the caudal aspect of the inferior articular process, positioned posterolateral to the vertebral body and immediately superior to the junction of lamina and pedicle. Its smooth, slightly convex cartilage bearing surface faces anteriorly and a little medially to meet the superior articular facet of the vertebra below, completing the paired zygapophyseal (facet) joints. Adjacent bony landmarks commonly included in this frame include the superior articular process above, the lamina sweeping medially toward the spinous process, and the transverse process projecting laterally within the thoracic spine. Orientation matters. Facet joint morphology in the thoracic region constrains axial rotation and contributes to rib cage stability, so subtle changes in facet orientation and joint space are clinically relevant in mid back pain. Degenerative zygapophyseal arthropathy can produce localized paraspinal tenderness and referred pain patterns that mimic costovertebral or pleural complaints, and osteophytes along the articular margins may narrow the dorsal aspect of the intervertebral foramen near the exiting thoracic spinal nerve. A fixed close range perspective on the inferior facet makes the boundary between the articular surface and the nonarticular cortical bone easy to teach, and it supports accurate discussions of capsular attachments and joint line palpation landmarks. Use this illustration in gross anatomy lab manuals, spine modules for orthopedic or physical therapy curricula, and radiology correlation pages that explain how CT or oblique plain film views relate to the posterior elements of the thoracic vertebrae. It also fits pain medicine or anesthesiology references describing thoracic medial branch blocks and intra articular facet injections, where naming the inferior articular process and its relationship to lamina and transverse process reduces procedural ambiguity. Anatomical accuracy verified by SciePro's Medical Advisory Board.