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Journal of Hand Surgery (British and European Volume)
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Articles

Variations of the Extensor Indicis Muscle and Tendon

M. KOMIYAMA
T. M. NWE
N. TOYOTA
Y. SHIMADA

From the Department of Anatomy and Cell Biology, School of Medicine, Chiba University, Chiba, Japan

Correspondence: M. Komiyama PhD, Department of Anatomy, School of Medicine, Chiba University, Chiba 260-8670, Japan., E-mail: komiyama{at}med.rn.chiba-u.ac.jp

Variations of the extensor indicis muscle were examined in 164 hands from 86 Japanese cadavers. Anomalous cases exhibiting supernumerary muscles or tendons were found in 22 hands. These variations were classified into four types: type 1, an additional tendon slip from the extensor indicis tendon; type 2, an extensor indicis radialis or extensor pollicis et indicis accessorius; type 3, an extensor medii proprius with or without extensor medii brevis; and type 4, an extensor indicis radialis and extensor medii proprius. The extensor medii proprius was the most common variation, followed by extensor indicis radialis. There were no clear differences in incidence of variations between men and women or between right and left hands. When variations were bilateral, both sides were identical or similar in type.

Journal of Hand Surgery (British and European Volume), Vol. 24, No. 5, 575-578 (1999)
DOI: 10.1054/JHSB.1999.0239
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R. Nayar and P. Mcarthur
A supernumerary extensor tendon to the thumb with an accessory tendon to extensor indicis
BMJ Case Reports, April 23, 2009; 2009(apr20_1): bcr0820080791 - bcr0820080791.
[Abstract] [Full Text]