Superior Articular Facet Of The Lumbar Vertebra, Anatomy

Description

Superior articular facet anatomy anchors this lumbar vertebra illustration, with the concave, smooth facet surface seated on the superior articular process at the junction of the pedicle and lamina. From a posterolateral vantage, the facet lies posterior to the vertebral body and superior to the inferior articular process, framing the zygapophyseal (facet) joint with the inferior articular facet of the vertebra above. The pars interarticularis bridges the superior and inferior articular processes just inferior to the facet, while the lamina runs medially toward the spinous process and the transverse process projects laterally from the vertebral arch. Orientation is unambiguous. Facet joint morphology in the lumbar spine governs segmental rotation and, when paired with intervertebral disc degeneration, drives the cascade toward facet arthropathy and foraminal narrowing. Clinicians correlate pain provocation on extension and rotation with hypertrophy at the superior articular process and osteophyte formation along the articular margins, a common anatomic substrate for lumbar spinal stenosis and lateral recess encroachment on the traversing nerve root. Crisp surface definition makes it easier to teach why lumbar facets are more sagittally oriented than cervical facets and why that matters during manual exam, CT interpretation, and procedure planning. Use this illustration in gross anatomy and musculoskeletal courses to teach zygapophyseal joint architecture, and in radiology or spine surgery texts to annotate the superior articular process, pars interarticularis, and adjacent lamina as landmarks on axial CT or oblique radiographs. Pain medicine groups will also find it well suited for explaining medial branch blocks and radiofrequency ablation targets relative to the facet joint line and posterior elements. Anatomical accuracy verified by SciePro's Medical Advisory Board.