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Case Report

Anat Cell Biol 2019; 52(1): 97-99

Published online March 1, 2019

https://doi.org/10.5115/acb.2019.52.1.97

Copyright © Korean Association of ANATOMISTS.

A rare bilateral variation on the dorsum of the hand: extensor digitorum brevis manus and extensor medii proprius

Department of Anatomy and Neurosciences, Eulji University School of Medicine, Daejeon, Korea.
*These two authors contributed equally to this work.

Correspondence to: Hong Il Yoo. Department of Anatomy and Neurosciences, Eulji University School of Medicine, 77 Gyeryong-ro 771beon-gil, Jung-gu, Daejeon 34824, Korea. Tel: +82-42-259-1627, Fax: +82-42-259-1629, Email: hiyoo@eulji.ac.kr

Received: September 18, 2018; Revised: October 24, 2018; Accepted: December 5, 2018

Abstract

A 78-year-old male cadaver showed bilateral anomalous muscles on the dorsum of the hand. An extensor digitorum brevis manus was noted on the dorsum of the right hand. It originated from the distal end of the radius and the radiocarpal joint ligaments and inserted into the metacarpophalangeal joint of the third digit. On the dorsum of the left hand, an extensor digiti medii proprius was identified. It originated from the distal third of the ulna near the extensor indicis proprius and the interosseous membrane and inserted into the metacarpophalangeal joint of the third digit. Awareness of these combined muscular variation would be helpful in understanding the identification of digital extensors and in requiring careful consideration for the reconstruction surgery of the hand.

Keywords: Forearm, Hand, Extensor digitorum brevis manus, Extensor medii proprius

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