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Bilateral accessory flexor indicis muscle: A case study.

A Hall1, G Davidson1, L Reid1

  • 1Centre for Anatomy and Human Identification, School of Science and Engineering, University of Dundee, DD1 5EH Dundee, Scotland.

Morphologie : Bulletin De L'Association Des Anatomistes
|October 27, 2023
PubMed
Summary
This summary is machine-generated.

A bilateral accessory forearm muscle was discovered during cadaveric dissection. This rare muscular variation may have clinical relevance for surgical procedures and understanding nerve compression syndromes.

Keywords:
Anatomical variationAnatomyFlexor digitorumForearmThiel-embalmed cadaver

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Area of Science:

  • Anatomy
  • Human Physiology
  • Morphology

Background:

  • Muscular variations in the upper extremities are frequently observed and documented.
  • These anatomical variations can lead to nerve compression and misdiagnosis, although they are often asymptomatic.
  • This report details a bilateral accessory muscle identified in the forearm during routine cadaveric dissection.

Discussion:

  • The accessory muscle originates from the medial epicondyle of the humerus, situated between the flexor digitorum superficialis and flexor carpi radialis origins.
  • It presents as a digastric muscle, with the distal belly identified as the first lumbrical muscle and the proximal belly acting as a supernumerary flexor.
  • This finding represents a functionally atavistic variation with potential clinical significance.

Key Insights:

  • Discovery of a bilateral accessory forearm muscle during cadaveric dissection.
  • Identification of its origin and dual-belly (digastric) structure, linking proximal belly to supernumerary flexor and distal belly to the first lumbrical.
  • Highlights the clinical relevance of this rare anatomical variation.

Outlook:

  • This accessory muscle variation could be a valuable source of donor muscle or tendon tissue for reconstructive surgery.
  • Understanding this anatomical anomaly is crucial for avoiding surgical complications and accurately diagnosing compressive neuropathies.
  • Further research into the prevalence and functional implications of this atavistic variation is warranted.