Lumbosacral trunk

The lumbosacral trunk is nervous tissue that connects the lumbar plexus with the sacral plexus.

Lumbosacral trunk
Plan of lumbar plexus.
Dissection of side wall of pelvis showing sacral and pudendal plexuses.
Details
FromL4-L5
Identifiers
Latintruncus lumbosacralis
TA98A14.2.07.026
TA26504
FMA65535
Anatomical terms of neuroanatomy

Structure

The lumbosacral trunk comprises the whole of the ventral rami of L5 and a part of L4.[1][2] It appears at the medial margin of the psoas major and runs downward over the pelvic brim to join the first sacral nerve.

The anterior division of the third sacral nerve divides into an upper and a lower branch, the former entering the sacral plexus and the latter the pudendal plexus. This connects the lumbar plexus and the sacral plexus.[2]

Clinical significance

The lumbosacral trunk may be compressed by the fetal head during the second stage of labour.[3] This causes some muscle weakness in the legs.[3] A full recovery is usually expected.[3]

Additional images

Reference

  1. Mirjalili, S. Ali (2015-01-01), Tubbs, R. Shane; Rizk, Elias; Shoja, Mohammadali M.; Loukas, Marios (eds.), "Chapter 46 - Anatomy of the Sacral Plexus L4-S4", Nerves and Nerve Injuries, San Diego: Academic Press, pp. 619–626, ISBN 978-0-12-410390-0, retrieved 2021-01-13
  2. Katirji, Bashar (2007-01-01), Katirji, Bashar (ed.), "Case 5", Electromyography in Clinical Practice (Second Edition), Philadelphia: Mosby, pp. 117–124, ISBN 978-0-323-02899-8, retrieved 2021-01-13
  3. Goyal, N.; Chad, D. A. (2014-01-01), "Lumbar Plexopathy", in Aminoff, Michael J.; Daroff, Robert B. (eds.), Encyclopedia of the Neurological Sciences (Second Edition), Oxford: Academic Press, pp. 923–926, ISBN 978-0-12-385158-1, retrieved 2021-01-13
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