Miniato Mohammed A., Black Asa C., Varacallo Matthew A.
Baylor College of Medicine
University of South Carolina Greenville School of Medicine
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 . Nerves and Blood Vessels in the Pelvis).
腰骶丛由第四和第五腰神经根的腹侧支形成条索状结构。神经干越过骶骨翼，与骶丛的坐骨部分相连。腰骶分支参与下肢各部位的神经支配（见骨盆中的神经和血管）。
