Lumbosacral Plexus Cheat Sheet

Lumbar Plexus — all 7 branches L1–L4 with motor, sensory, and clinical notes including meralgia paresthetica and obturator hernia

Sacral Plexus — all 12 branches L4–S4 including pudendal nerve and pelvic splanchnic nerves

Sciatic Nerve Breakdown — common fibular vs tibial division side by side, plus dermatomes and myotomes L1–S4, plus all lower limb reflexes

Injury Patterns — 8 syndromes including cauda equina, tarsal tunnel, meralgia paresthetica, Trendelenburg, foot drop

Mnemonics & High-Yield Facts — including S2–S4, cauda equina red flags, foot drop causes, saphenous nerve rule