Definition: plexus formed by the fourth and fifth lumbar (lumbosacral trunk) and first, second, and third sacral nerves; it lies on the inner surface of the posterior wall of the pelvis usually embedded in the piriformis muscle; its nerves supply the lower limbs, its major product being the sciatic nerve.
Synonym(s): plexus sacralisTA, ischiadic plexus, sciatic plexus
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