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Related Experiment Videos

Triceps brachii muscle demonstrating a fourth head.

R Shane Tubbs1, E George Salter, W Jerry Oakes

  • 1Section of Pediatric Neurosurgery, University of Alabama at Birmingham and Children's Hospital Birmingham, Alabama 35233, USA. rstubbs@uab.edu

Clinical Anatomy (New York, N.Y.)
|April 4, 2006
PubMed
Summary

Anatomical variations of the triceps brachii muscle are uncommon. A rare additional attachment of the medial head was identified, potentially causing neurovascular compression in the posterior arm.

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Response.

Journal of neurosurgery·2009

Area of Science:

  • Anatomy
  • Human Morphology
  • Surgical Anatomy

Background:

  • The triceps brachii muscle is crucial for elbow extension.
  • Variations in its anatomy are infrequently documented.
  • Understanding anatomical variations is vital for clinical practice.

Observation:

  • An unusual additional attachment of the medial head of the triceps brachii was observed.
  • This variation was noted on the left side of a male cadaver.
  • The anomalous head originated from the posterior aspect of the surgical neck of the humerus.

Findings:

  • The medial head of the triceps brachii exhibited an atypical origin.
  • This finding represents a rare anatomical variation.
  • The aberrant muscle attachment could influence surrounding neurovascular structures.

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Implications:

  • Clinicians should consider anomalous muscles in the posterior arm.
  • Such variations may be implicated in cases of unexplained arm weakness or pain.
  • Awareness of these anatomical anomalies aids in accurate diagnosis and treatment of posterior arm conditions.