Lumbosacral trunk
Citation, DOI, disclosures and article data
At the time the article was created Craig Hacking had no recorded disclosures.
View Craig Hacking's current disclosuresAt the time the article was last revised Saj Sriselvakumar had no financial relationships to ineligible companies to disclose.
View Saj Sriselvakumar's current disclosuresThe lumbosacral trunk is the distal trunk of the lumbar plexus arising from the anterior rami of the L4 and L5 nerve roots which contributes to the sacral plexus.
Gross anatomy
Origin
It arises from anterior rami of L4-L5 roots of the lumbar plexus.
Course
emerges over the medial border of the iliacus muscle, medial to the psoas major muscle and inferiorly over pelvic brim 2
it descends to join with the S1 nerve root to contribute to the sacral plexus
Branches
The lumbosacral trunk contributes fibers to the:
sciatic nerve (L4-S3)
superior gluteal nerve (L4-S1)
inferior gluteal nerve (L5-S2)
nerve to quadratus femoris and inferior gemellus muscles (L4-S1)
nerve to internal obturator and superior gemellus muscles (L5-S2)
References
- 1. Moore KL, Agur AMR, Dalley AF. Clinically oriented anatomy. LWW. ISBN:1451119453. Read it at Google Books - Find it at Amazon
- 2. Mohammed A. Miniato, Asa C. Black, Matthew Varacallo. Anatomy, Back, Lumbosacral Trunk. StatPearls Publishing. 2023. https://www.ncbi.nlm.nih.gov/books/NBK539878/ - Pubmed
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