Lumbar Vertebra's Articular Facet, Inferior View

Description

Inferior articular facets of a lumbar vertebra occupy the posterolateral corners of the vertebral arch, sitting on the inferior articular processes just lateral to the base of the spinous process and posterior to the vertebral body. From this inferior viewpoint, each facet surface appears as a smooth, oval to kidney-shaped area oriented mainly sagittally, facing inferiorly to meet the superior articular facets of the vertebra below and form the paired zygapophysial (facet) joints. The laminae converge medially toward the spinous process, while the pedicles and vertebral foramen frame the central canal region anterior to the facets. Transverse processes extend laterally, providing a fixed bony reference for level recognition in the lower back. Facet orientation in the lumbar spine governs coupled motion and load sharing between vertebrae, and it also explains common pain generators. Degenerative change at the zygapophysial joints, including osteoarthrosis, synovial cyst formation, and capsular hypertrophy, often presents with extension-related low back pain and can contribute to lateral recess or foraminal stenosis at L4-L5 or L5-S1. The inferior perspective isolates the joint-bearing surfaces and their relationship to the midline posterior elements, which is the relationship you need when correlating oblique lumbar radiographs, CT evaluation of facet hypertrophy, or planning medial branch blocks and radiofrequency ablation targets around the junction of the superior articular process and transverse process. Use this illustration in gross anatomy and musculoskeletal modules to teach lumbar zygapophysial joints, in spine surgery texts to orient posterior element landmarks, or in pain medicine materials to support facet-mediated back pain discussions. A strong asset for correlating bony anatomy with CT-guided and fluoroscopy-guided facet interventions. Anatomical accuracy verified by SciePro's Medical Advisory Board.