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Absence of the Lumbosacral Trunk
Cameron K Schmidt1, Joe Iwanaga2, Emre Yilmaz3
1Clinical Anatomy, Seattle Science Foundation.
Cureus
|January 9, 2018
Summary
This study details a rare anatomical variation where the lumbosacral trunk lacked L4 contribution. Understanding this variation is crucial for surgical and clinical practice.
Area of Science:
- Anatomy
- Neuroscience
- Surgical Anatomy
Background:
- The lumbosacral trunk typically forms from L4 and L5 nerve roots, connecting lumbar and sacral plexuses.
- Developmental variations influence the relative contributions of L4 and L5 to this nerve bundle.
Observation:
- A rare case of an adult male cadaver dissection revealed an atypical lumbosacral trunk.
- This specific variation showed no contribution from the fourth lumbar (L4) ventral rami.
Findings:
- The observed lumbosacral trunk was formed solely by the fifth lumbar (L5) ventral rami.
- This represents a significant deviation from the typical anatomical composition.
Implications:
- Anatomical variations in the lumbosacral trunk can impact surgical procedures in the lumbosacral region.
- Clinical awareness of such variations is essential for accurate diagnosis and treatment planning.
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