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Bilateral extensor medii digiti: a rare anatomical variation

M F Abu-Hijleh1

  • 1Department of Human and Clinical Anatomy, Sultan Qaboos University, Muscat, Oman.

Journal of Hand Surgery (Edinburgh, Scotland)
|October 1, 1993
PubMed
Summary

A unique bilateral supernumerary extensor muscle to the middle finger was discovered in a male cadaver, originating from the ulna. This rare anatomical variation has significant implications for hand surgery and understanding morphological variability.

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Area of Science:

  • Anatomy
  • Morphology
  • Human Anatomy

Background:

  • Anatomical variations in the human hand are well-documented.
  • Extensor muscles of the hand typically originate from the forearm.
  • The middle finger has specific extensor muscle attachments.

Observation:

  • A supernumerary extensor muscle to the middle finger was identified bilaterally in a male cadaver.
  • The muscle originated from the distal ulna.
  • Its tendon inserted into the proximal phalanx of the middle finger.

Findings:

  • The bilateral presence and specific insertion point of this muscle appear to be unique based on literature review.
  • This represents a rare morphological variation in forearm musculature.
  • Detailed morphological analysis confirmed the unique characteristics of the observed muscle.

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Implications:

  • Anatomical variations like this can impact surgical procedures, particularly tendon transfers in the hand.
  • Awareness of such variations is crucial for orthopedic surgeons and anatomists.
  • Understanding morphological variability aids in preventing surgical complications and improving patient outcomes.