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Surgical and Radiologic Anatomy
Published in: Surgical and Radiologic Anatomy 3/2018

01-03-2018 | Anatomic Variations

Variant course of extensor pollicis brevis tendon in the third extensor compartment

Authors: Shiro Sugiura, Yusuke Matsuura, Takane Suzuki, Satoru Nishikawa, Chisato Mori, Kazuki Kuniyoshi

Published in: Surgical and Radiologic Anatomy | Issue 3/2018

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Abstract

Introduction

According to the anatomical literature, the extensor pollicis brevis (EPB) tendon passes through the first compartment and enters the base of the proximal phalanx of the thumb. There have been a few reports on the different types of supernumerary EPB tendons; however, an unusual course of the EPB tendon is extremely rare.

Materials and methods

During routine cadaveric dissection in the Department of Gross Anatomy, we detected an variant EPB muscle in a 96-year-old fresh female cadaver.

Results

The EPB muscle originated from the posterior surface of the radius and interosseous membrane. However, the EPB tendon passed through the third compartment instead of the first compartment. It ran parallel to the extensor pollicis longus (EPL) tendon and entered the base of the thumb proximal phalanx. The EPL tendon was attached to the base of the first distal phalanx, as normally observed. Both EPB and EPL muscles were innervated by the posterior interosseous nerve.

Conclusions

We report a case of a variant course of the EPB tendon appearing in the third extensor compartment of the wrist with the EPL tendon. The knowledge of this anatomic variation will be helpful for accurate diagnosis and surgical planning.
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Metadata
Title
Variant course of extensor pollicis brevis tendon in the third extensor compartment
Authors
Shiro Sugiura
Yusuke Matsuura
Takane Suzuki
Satoru Nishikawa
Chisato Mori
Kazuki Kuniyoshi
Publication date
01-03-2018
Publisher
Springer Paris
Published in
Surgical and Radiologic Anatomy / Issue 3/2018
Print ISSN: 0930-1038
Electronic ISSN: 1279-8517
DOI
https://doi.org/10.1007/s00276-017-1923-y

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