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Related Experiment Videos

The intradural cervical plexus. An absent cervical nerve root

S O'Leary1, R Stacey, P Hamlyn

  • 1Department of Trauma and Orthopaedics, Wexham Park Hospital, Slough, Berkshire, United Kingdom.

Surgical and Radiologic Anatomy : SRA
|January 1, 1997
PubMed
Summary

Anatomical study of the spinal accessory nerve (Sp. XI) revealed a rare variant: absence of the left C2 dorsal nerve root. This finding may impact understanding of neck muscle proprioception and motor control.

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Area of Science:

  • Neurosurgery
  • Anatomy
  • Clinical Neuroscience

Background:

  • The spinal accessory nerve (Sp. XI) plays a role in human neck musculature function.
  • Recent studies highlight the Sp. XI's intradural plexus-like morphology.
  • Speculation exists regarding Sp. XI's involvement in proprioception and motor control.

Purpose of the Study:

  • To document an unusual anatomical variant discovered during microsurgical anatomy dissection of the Sp. XI.
  • To review the general anatomy of the Sp. XI and current functional hypotheses.

Main Methods:

  • Dissection of the intradural and peripheral pathways of the spinal accessory nerve (Sp. XI).
  • Observation and documentation of anatomical variations in cadaveric specimens.

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Main Results:

  • Discovery of a previously unreported anatomical variant: complete absence of the left C2 dorsal nerve root.
  • This variant was identified during the dissection of the Sp. XI pathways.

Conclusions:

  • The identified absence of the C2 dorsal nerve root is a significant anatomical variant.
  • This finding warrants further investigation into the functional implications for proprioception and motor control of neck muscles, particularly concerning the Sp. XI.