Articular Facet Of The Lumbar Vertebra, Anatomy

Description

Lumbar zygapophysial (facet) joints anchor this illustration, with the superior articular facets sitting on the superior articular processes and facing posteromedially, and the inferior articular facets positioned on the inferior articular processes and facing anterolaterally. The paired facets bracket the vertebral arch, lying posterior to the vertebral body and pedicles and adjacent to the laminae as they converge toward the spinous process. Transverse processes project laterally, while the pars interarticularis is identifiable between the superior and inferior articular processes, a narrow bridge that often draws attention in lumbar anatomy teaching. Facet orientation in the lumbar spine biases motion toward flexion and extension while limiting axial rotation, and the articular cartilage surfaces become clinically relevant when degeneration produces facet arthropathy, synovial cysts, or foraminal narrowing with radicular symptoms. Low back pain workups routinely consider the medial branches of the dorsal rami that innervate these joints, which is why the bony landmarks around the superior articular process and the groove between the transverse process and the superior articular process matter for medial branch blocks and radiofrequency ablation planning. Small joint, big problem. Use this illustration in spine modules for gross anatomy, orthopaedics, chiropractic education, and radiology correlation when explaining facet joint tropism, spondylolisthesis risk related to posterior element anatomy, or the difference between discogenic and facet-mediated pain. It also fits procedural manuals and patient-facing materials that need an accurate bony map of the lumbar posterior elements without distracting soft-tissue detail. Anatomical accuracy verified by SciePro's Medical Advisory Board.