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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
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.
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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