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Case Reports
. 2019 Mar;52(1):97-99.
doi: 10.5115/acb.2019.52.1.97. Epub 2019 Mar 29.

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

Dong Hyun Lee  1 , Jae Hee Lee  1 , Ran Sook Woo  1 , Dae Yong Song  1 , Tai Kyung Baik  1 , Hong Il Yoo  1
Affiliations
Case Reports

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

Dong Hyun Lee et al. Anat Cell Biol. 2019 Mar.

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: Extensor digitorum brevis manus; Extensor medii proprius; Forearm; Hand.

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Figures

Fig. 1
Fig. 1. (A, B) Digital photograph and a sketch show the origin and insertion of the extensor digitorum minimi (EDBM) on the dorsum of the right hand. APL, abductor pollicis longus; DBUN, dorsal branch of the ulnar nerve; ED, extensor digitorum; EDM, extensor digitorum minimi; EIP, extensor indicis proprius; EPB, extensor pollicis brevis; EPL, extensor pollicis longus.
Fig. 2
Fig. 2. (A, B) Digital photograph and a sketch show the origin and insertion of the extensor medii proprius (EMP) on the dorsum of the left hand. APL, abductor pollicis longus; DBUN, dorsal branch of the ulnar nerve; ED, extensor digitorum; EDM, extensor digitorum minimi; EIP, extensor indicis proprius; EPB, extensor pollicis brevis; EPL, extensor pollicis longus.
See this image and copyright information in PMC

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