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Related Experiment Video

Updated: Jun 21, 2026

Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies
08:56

Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies

Published on: October 7, 2021

Classifying musculocutaneous nerve variations.

Roberto A Guerri-Guttenberg1, Mariana Ingolotti

  • 1Department of Anatomy, School of Biomedical Sciences, Austral University, Pilar, Buenos Aires, Argentina. rguttenberg@gmail.com

Clinical Anatomy (New York, N.Y.)
|July 29, 2009
PubMed
Summary
This summary is machine-generated.

Anatomical variations of the musculocutaneous nerve (MC) are common, with frequent communications to the median nerve. Understanding these variations is crucial for interpreting nerve injuries and anomalous innervation patterns.

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Last Updated: Jun 21, 2026

Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies
08:56

Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies

Published on: October 7, 2021

Area of Science:

  • Anatomy
  • Neuroscience

Background:

  • Anatomical variations in the musculocutaneous nerve (MC) can impact upper limb function and clinical diagnosis.
  • Existing classifications of MC variations are insufficient for a comprehensive understanding.

Purpose of the Study:

  • To document anatomical variations of the musculocutaneous nerve (MC) through cadaveric dissections.
  • To systematically review and critique current classifications of MC variations.
  • To propose a novel, integrated classification for MC variations.

Main Methods:

  • Dissection of 56 upper limbs from fetal and adult cadavers.
  • Systematic literature review of existing musculocutaneous nerve variation classifications.
  • Analysis of communication patterns between the musculocutaneous and median nerves.

Main Results:

  • Musculocutaneous nerve (MC) variations were observed in 53.6% of dissections, primarily involving communications with the median nerve.
  • The musculocutaneous nerve (MC) did not pierce the coracobrachialis muscle in 6 out of 54 cases.
  • Absence of the MC or distal origin with the median nerve occurred in a small percentage of specimens.

Conclusions:

  • A high prevalence of musculocutaneous nerve (MC) variations necessitates an updated classification system.
  • The proposed integrated classification provides a more detailed overview of MC variations.
  • Understanding these anatomical variations is vital for accurate diagnosis and management of upper limb neurological conditions.