| Lumbosacral trunk | |
|---|---|
) Plan of lumbar plexus. | |
) Dissection of side wall of pelvis showing sacral and pudendal plexuses. | |
| Details | |
| From | L4-L5 |
| Identifiers | |
| Latin | truncus lumbosacralis |
| TA98 | A14.2.07.026 |
| TA2 | 6504 |
| FMA | 65535 |
| Anatomical terms of neuroanatomy | |
The lumbosacral trunk is nervous tissue that connects the lumbar plexus with the sacral plexus.
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
Lumbosacral trunk
Ramus communicans.Sacral symphatetic with S1.
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Reference
- ^ 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
- ^ a b 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
- ^ a b c Goyal, N.; Chad, D. A. (2014-01-01), Aminoff, Michael J.; Daroff, Robert B. (eds.), "Lumbar Plexopathy", Encyclopedia of the Neurological Sciences (Second Edition), Oxford: Academic Press, pp. 923–926, ISBN 978-0-12-385158-1, retrieved 2021-01-13
External links
- Anatomy photo:43:15-0103 at the SUNY Downstate Medical Center - "The Female Pelvis: The Posterolateral Pelvic Wall"
- posteriorabdomen at The Anatomy Lesson by Wesley Norman (Georgetown University)
- figures/chapter_30/30-6.HTM: Basic Human Anatomy at Dartmouth Medical School