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introductionstatpearls· Introduction· item NBK539878
The lumbosacral plexus arises as a cordlike structure from the ventral rami of the fourth and fifth lumbar nerve roots. The nerve trunk passes over the sacral ala to join the sciatic portions of the sacral plexus. Lumbosacral branches contribute to the innervation of various parts of the lower limb (see Image. Nerves and Blood Vessels in the Pelvis).