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Lumbosacral trunk

Nervous tissue that connects the lumbar plexus with the sacral plexus

Summary

Nervous tissue that connects the lumbar plexus with the sacral plexus

FieldValue
NameLumbosacral trunk
Latintruncus lumbosacralis
ImageLumbar_plexus.svg
CaptionPlan of lumbar plexus.
Image2Gray829.png
Caption2Dissection of side wall of pelvis showing sacral and pudendal plexuses.
BranchFromL4-L5

The lumbosacral trunk is nervous tissue that connects the lumbar plexus with the sacral plexus. It is formed by the union of parts of the fourth and fifth lumbar nerves and descends to join the sacral plexus.

Anatomy

The lumbosacral trunk is formed by the union of the entire anterior ramus of lumbar nerve L5 .**** L4 first issues its branches to the lumbar plexus, then emerges from the medial border of the psoas muscle**** to unite with the anterior ramus of L5 just superior to the pelvic brim to form the thick, cord-like trunk which crosses the pelvic brim (medial to the obturator nerve)**** to descend upon the anterior surface of the ala of sacrum before joining the sacral plexus.

Like the sacral nerves, the lumbosacral trunks splits into an anterior division and a posterior division before recombining to form nerves for the flexor and extensor compartments of the lower limb.****

Clinical significance

The lumbosacral trunk may be compressed by the fetal head during the second stage of labour. This causes some muscle weakness in the legs. A full recovery is usually expected.

Additional images

File:Slide9w.JPG|Lumbosacral trunk File:Slide2ROGER.JPG|Ramus communicans.Sacral symphatetic with S1.

References

References

  1. Mirjalili, S. Ali. (2015-01-01). "Chapter 46 - Anatomy of the Sacral Plexus L4-S4". Academic Press.
  2. Katirji, Bashar. (2007-01-01). "Case 5". Mosby.
  3. Sinnatamby, Chummy S.. (2011). "Last's Anatomy".
  4. (2017). "Essential Clinical Anatomy". Lippincott Williams & Wilkins.
  5. (2014-01-01). "Lumbar Plexopathy". Academic Press.
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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