open access

Vol 76, No 4 (2017)
ORIGINAL ARTICLES
Published online: 2017-05-25
Submitted: 2017-03-24
Accepted: 2017-05-08
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An anatomical study of additional radial wrist extensors including a unique extensor carpi radialis accessorius

C. T. West, D. Ricketts, C. Brassett
DOI: 10.5603/FM.a2017.0047
·
Pubmed: 28553852
·
Folia Morphol 2017;76(4):742-747.

open access

Vol 76, No 4 (2017)
ORIGINAL ARTICLES
Published online: 2017-05-25
Submitted: 2017-03-24
Accepted: 2017-05-08

Abstract

Background: In this study, 82 forearms from 41 cadavers were dissected to establish the incidence of variant additional radial wrist extensors. Three variants have been described in the literature: extensor carpi radialis intermedius (ECRI), extensor carpi radialis accessorius (ECRA) and extensor carpi radialis tertius (ECRT).

Materials and methods: Of the 41 cadavers studied, 5/41 (12%) had an additional radial wrist extensor. Of these 5 individuals, 2 had bilateral additional muscles and 3 were unilateral. Of the 82 forearms, 7/82 (9%) had additional radial wrist extensors.

Results: We found 4 examples of ECRI and 3 examples of ECRA. We did not find any examples of ECRT. One specimen of ECRA had an atypical, previously undescribed, course.

Conclusions: These accessory muscles are of clinical relevance, as they may be a contributing factor in tennis elbow and nerve entrapment, or cause diagnostic confusion, especially in ultrasound scans. However, they may also be used for tendon transfer. Of the 7 muscles found in the current study, 3 would have been suitable for such procedures.  

Abstract

Background: In this study, 82 forearms from 41 cadavers were dissected to establish the incidence of variant additional radial wrist extensors. Three variants have been described in the literature: extensor carpi radialis intermedius (ECRI), extensor carpi radialis accessorius (ECRA) and extensor carpi radialis tertius (ECRT).

Materials and methods: Of the 41 cadavers studied, 5/41 (12%) had an additional radial wrist extensor. Of these 5 individuals, 2 had bilateral additional muscles and 3 were unilateral. Of the 82 forearms, 7/82 (9%) had additional radial wrist extensors.

Results: We found 4 examples of ECRI and 3 examples of ECRA. We did not find any examples of ECRT. One specimen of ECRA had an atypical, previously undescribed, course.

Conclusions: These accessory muscles are of clinical relevance, as they may be a contributing factor in tennis elbow and nerve entrapment, or cause diagnostic confusion, especially in ultrasound scans. However, they may also be used for tendon transfer. Of the 7 muscles found in the current study, 3 would have been suitable for such procedures.  

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Keywords

extensor carpi radialis brevis, extensor carpi radialis longus, extensor carpi radialis accessorius, extensor carpi radialis intermedius

About this article
Title

An anatomical study of additional radial wrist extensors including a unique extensor carpi radialis accessorius

Journal

Folia Morphologica

Issue

Vol 76, No 4 (2017)

Pages

742-747

Published online

2017-05-25

DOI

10.5603/FM.a2017.0047

Pubmed

28553852

Bibliographic record

Folia Morphol 2017;76(4):742-747.

Keywords

extensor carpi radialis brevis
extensor carpi radialis longus
extensor carpi radialis accessorius
extensor carpi radialis intermedius

Authors

C. T. West
D. Ricketts
C. Brassett

References (17)
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