Articular Facet Of The Lumbar Vertebra In Anterior View

Description

Lumbar zygapophysial (facet) articular cartilage occupies the smooth, ovoid surface on the articular process of a typical lumbar vertebra, with the facet positioned posterolateral to the vertebral body and just superior to the junction of pedicle and lamina. From an anterior perspective, the vertebral body dominates the midline, while the articular facet is appreciated at the lateral margin of the posterior elements, oriented largely in the sagittal plane compared with thoracic facets. Bony contours around the facet transition into the pars interarticularis and the base of the transverse process, establishing the relationship between the joint surface and the posterior arch. Orientation matters. Facet joint anatomy underpins a large share of mechanical low back pain and is a common generator in lumbar spondylosis, where hypertrophy of the articular processes and capsular thickening can narrow the lateral recess and contribute to radicular symptoms even without a large disc herniation. The fixed anterior viewpoint helps learners reconcile an apparently posterior joint with anterior landmarks used in imaging reports, making it easier to map the articular surface to adjacent pedicles, vertebral body margins, and the intervertebral foramen level seen on CT and MRI. Surface smoothness and the rim of subchondral bone are defined enough to support discussions of osteophyte formation, facet tropism, and the typical L4 to L5 and L5 to S1 distribution of degenerative change. Use this illustration in gross anatomy and musculoskeletal anatomy courses when introducing the posterior elements of the lumbar spine, and in spine surgery or pain medicine materials covering medial branch blocks, radiofrequency ablation targets, and decompression for facet-related stenosis. It also fits radiology teaching files that correlate lumbar facet orientation with oblique CT and parasagittal MRI appearances. Anatomical accuracy verified by SciePro's Medical Advisory Board.