Flavum Ligament, Posterior View

Description

Running between adjacent lumbar laminae, the ligamenta flava form paired yellow, elastic bands that line the posterior wall of the vertebral canal. From a posterior perspective, the spinous processes sit in the midline, with the laminae flaring laterally toward the facet (zygapophysial) joints and transverse processes, while the ligamentum flavum bridges each interlaminar space deep to the bony arch. Intervertebral discs lie anterior to this plane between vertebral bodies, but their segmental levels help orient the viewer to L1 through L5. Clinically, the ligamentum flavum matters because it is the structure the surgeon or proceduralist encounters immediately deep to the lamina during lumbar laminectomy, laminotomy, or interlaminar epidural access. Hypertrophy, fibrosis, or infolding of this elastic ligament contributes to central canal stenosis, often at L4 to L5, and it can narrow the lateral recess where the traversing nerve root courses. Small shifts in posture change its bulge into the canal. That detail explains why extension worsens neurogenic claudication in many patients. Use this posterior lumbar spine view to teach vertebral arch anatomy in gross anatomy, neuroanatomy, and MSK blocks, where students confuse the ligamentum flavum with the interspinous and supraspinous ligaments. It also supports spine surgery and pain medicine content, including figures for lumbar decompression techniques, epidural injection approaches, and radiology correlation when discussing thickened ligamentum flavum on axial MRI. Anatomical accuracy verified by SciePro's Medical Advisory Board.