Superior Articular Surface of the Vertebra

Description

Seen in lateral profile, two adjacent lumbar vertebrae are rendered with their vertebral bodies stacked superior to inferior and separated by an intervertebral disc. The superior articular surface of the inferior vertebra (facet) is emphasized in blue at the pars interarticularis, positioned posterior to the vertebral body and medial to the transverse process, where it meets the inferior articular process of the vertebra above. Posterior elements including the spinous processes project dorsally, while the transverse processes extend laterally, framing the facet joint complex. Facet orientation in the lumbar spine, with superior articular facets generally facing posteromedially, governs flexion and extension while limiting axial rotation, so a clear read on the superior articular surface is central when teaching segmental kinematics. Clinically, this region is a common pain generator in lumbar facet arthropathy and synovial cyst formation, and the pars immediately adjacent to the facet is the site of spondylolysis that can precede isthmic spondylolisthesis. Small area. Big consequences. Use this illustration for gross anatomy and musculoskeletal modules covering zygapophysial (facet) joints, biomechanics of the lumbar column, and the relationship of the intervertebral disc to posterior element load sharing. It also suits radiology and spine surgery teaching materials that correlate lateral anatomy with oblique radiographs or CT targeting of the pars and facet joint during medial branch blocks or radiofrequency ablation planning. Anatomical accuracy verified by SciePro's Medical Advisory Board.