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A split and conjoined median nerve in the forearm.

Hyung-Sun Won¹, Chang-Seok Oh, In-Hyuk Chung

¹Department of Anatomy and Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Korea.

Anatomical Science International

|April 2, 2009

Summary

A rare median nerve variation was found where it split in the forearm and rejoined before the carpal tunnel. This anatomical anomaly, with an unusual muscle slip, may lead to nerve entrapment.

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Area of Science:

Anatomy
Neuroscience
Clinical Medicine

Background:

The median nerve is crucial for forearm and hand function.
Variations in peripheral nerve anatomy can impact clinical diagnosis and treatment.
Understanding anatomical anomalies is vital for surgical and diagnostic procedures.

Observation:

A unique median nerve variation was observed in the forearm.
The median nerve bifurcated into medial and lateral divisions proximally, then reunited distally.
An aberrant slip from the flexor digitorum superficialis muscle coursed over the medial division.

Findings:

The medial division of the split median nerve was larger than the lateral division.
The aberrant muscle slip potentially compresses the medial nerve division.
This anatomical variation has not been previously reported in literature.

Implications:

This median nerve anomaly may predispose individuals to entrapment syndromes.
It could complicate the diagnosis and treatment of median nerve neuropathies.
Awareness of this variation is important for clinicians evaluating forearm and wrist pain.