Lateral Cutaneous Nerve of the Thigh, Posterior View

Description

Posterior trunk anatomy frames the lumbar plexus and its peripheral branches as they emerge from the ventral rami of L1 to L3 within psoas major, then course laterally toward the iliac crest and pelvis. The lateral femoral cutaneous nerve (lateral cutaneous nerve of the thigh) is traced as it approaches the anterior superior iliac spine, passing inferior to the inguinal ligament to enter the anterolateral thigh, even though the overall perspective remains posterior. Centrally, the vertebral column and spinal cord sit in the midline, with segmental nerves projecting laterally; nearby, the kidneys and major posterior abdominal vessels provide anatomic reference for the retroperitoneal setting. Color coding separates neural elements from accompanying arteries and veins as they descend toward the pelvic brim. Posterior visualization of a predominantly anteriorly symptomatic nerve is not a contradiction, it is a teaching advantage: you can follow the lateral femoral cutaneous nerve back to its lumbar roots and distinguish it from the femoral nerve and obturator nerve before the branches diverge below the inguinal ligament. That matters in meralgia paresthetica, where entrapment near the anterior superior iliac spine or under a tight inguinal ligament produces burning dysesthesia over the anterolateral thigh without motor deficit. It also matters in pelvic and spine surgery. Retractor placement in anterior approaches to the lumbar spine, iliac crest bone graft harvest, and prone positioning can all place the nerve at risk, so clear root level and fascial relationships help explain postoperative sensory complaints. Use this artwork in gross anatomy teaching for the posterior abdominal wall and lumbar plexus, in surgical atlases covering lateral pelvic exposure and iliac crest harvest, or in pain medicine materials on nerve entrapment syndromes and diagnostic nerve blocks near the ASIS. It also supports radiology education when correlating MRI or ultrasound-guided localization of the lateral femoral cutaneous nerve with lumbar root pathology. Anatomical accuracy verified by SciePro's Medical Advisory Board.