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The subanconeus muscle.

R S Tubbs1, W J Oakes, E G Salter

  • 1Department of Cell Biology, University of Alabama at Birmingham, AL, USA. rstubbs@uab.edu

Folia Morphologica
|June 20, 2006
PubMed
Summary

The subanconeus muscle likely does not exist as a separate entity. Deep fibers of the triceps brachii muscle may compress the elbow joint capsule, potentially aiding in cushioning during forearm extension.

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Area of Science:

  • Anatomy
  • Biomechanics
  • Elbow Joint Anatomy

Background:

  • The subanconeus (articularis cubiti) muscle's anatomy and function remain poorly understood.
  • Existing theories propose its role in retracting the posterior elbow joint capsule during forearm extension.

Purpose of the Study:

  • To investigate the presence, morphology, and function of the subanconeus muscle.
  • To clarify the anatomical relationship between the triceps brachii muscle and the posterior elbow joint capsule.

Main Methods:

  • Dissection of 18 cadaveric posterior elbow joint capsules.
  • Examination of fibers attaching the triceps brachii muscle to the capsule.

Main Results:

  • All specimens showed muscular attachments from the medial head of the triceps brachii to the posterior joint capsule.
  • No distinct subanconeus muscle belly was identified; these were deeper triceps brachii attachments.
  • Tension on these fibers caused capsule compression, not retraction.

Conclusions:

  • The subanconeus muscle, as a distinct entity, is likely absent.
  • Deep triceps brachii fibers may compress the posterior elbow capsule, potentially stabilizing the elbow fat pad during extension.

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