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Variations of the extensor indicis muscle and tendon
M Komiyama1, T M Nwe, N Toyota
1Department of Anatomy and Cell Biology, School of Medicine, Chiba University, Japan. komiyama@med.m.chiba-u.ac.jp
Journal of Hand Surgery (Edinburgh, Scotland)
|December 22, 1999
Summary
Anatomical variations of the extensor indicis muscle were studied in Japanese cadavers. Extensor medii proprius and extensor indicis radialis were the most common anomalies found in the extensor indicis muscle.
Area of Science:
- Anatomy
- Morphology
Background:
- The extensor indicis muscle is crucial for index finger extension.
- Anatomical variations of this muscle can impact surgical procedures and biomechanics.
Purpose of the Study:
- To investigate and classify variations of the extensor indicis muscle in a Japanese population.
Main Methods:
- Dissection of 164 hands from 86 Japanese cadavers.
- Classification of observed anatomical variations into distinct types.
Main Results:
- Variations were identified in 22 out of 164 hands.
- The most frequent variations were extensor medii proprius and extensor indicis radialis.
- No significant differences in variation incidence were noted between sexes or hands; bilateral variations were often symmetrical.
Conclusions:
- The study details common variations of the extensor indicis muscle, including extensor medii proprius and extensor indicis radialis.
- Understanding these anatomical variations is important for clinical practice and anatomical studies.