Lumbosacral Plexus

  • Amgad S. Hanna


The lumbar plexus arises from the ventral rami of L1–L5 nerve roots. It forms within the psoas major muscle. The nerves are divided into three groups based on their relationship to the psoas muscle as they enter the retroperitoneal space. The sacral plexus arises from the ventral rami of L4–S4. It forms in the pelvis anterior to the piriformis muscle.

Supplementary material

Video 15.1

(MP4 1151612 kb)


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Amgad S. Hanna
    • 1
  1. 1.Department of NeurosurgeryUniversity of WisconsinMadisonUSA

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