Anatomy
·Lower Limb
Lumbosacral Plexus
⭐ PREMIUM
The lumbar (T12–L4) and sacral (L4–S4) plexuses supply the lower limb. Roots and the major branches are core knowledge.
LUMBAR PLEXUS (within psoas)
• Iliohypogastric, ilioinguinal (L1); genitofemoral (L1,2); lateral cutaneous nerve of thigh (L2,3); obturator (L2–4); femoral (L2–4).
SACRAL PLEXUS (on piriformis)
• Sciatic (L4–S3 — the largest nerve), superior gluteal (L4–S1), inferior glutea…
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