Superior Articular Process Of The Thoracic Vertebrae, Anatomy

Description

Superior articular processes of a typical thoracic vertebra rise from the junction of the pedicle and lamina, flanking the vertebral foramen on the posterior aspect of the vertebral arch. Each superior articular facet forms a smooth, gently concave surface that faces posteriorly, with a slight lateral orientation, positioning it to meet the inferior articular facet of the vertebra above. The base of the process blends laterally into the transverse process and medially into the lamina, while the spinous process projects inferiorly and posteriorly in the midline as a prominent landmark. Facet orientation in the thoracic spine governs segmental kinematics and helps explain clinical patterns of pain and instability in the chest-level spine. Posterior-facing superior articular facets favor rotation and limit flexion-extension compared with the lumbar region, and they set the geometry for the zygapophysial (facet) joints that can generate localized paraspinal pain in thoracic facet arthropathy or after whiplash-type trauma. Surface finish and edge definition in this illustration make the joint line, the margin of the superior articular process, and its relationship to the lamina and transverse process easy to distinguish. Small details matter here. Use this illustration in gross anatomy and osteology teaching to contrast thoracic facet planes with cervical and lumbar vertebrae, or in radiology and pain-medicine materials that correlate thoracic zygapophysial joints with CT/MRI appearance and fluoroscopy-guided medial branch blocks. It also suits orthopedic and neurosurgical references that need accurate bony landmarks for posterior approaches and instrument placement at mid-thoracic levels. Anatomical accuracy verified by SciePro's Medical Advisory Board.