Anatomical Variation of the Abductor Pollicis Longus
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Authors
P. Bray, David
R. Kelliher, Kevin
Issue Date
2023-03-24
Type
Other
Language
en_US
Keywords
Anatomy , Muscles , Abductor Pollicis Longus
Alternative Title
Abstract
There are three muscles in the forearm that are primarily responsible for creating what's known as the typical "hitchhiker's thumb" appearance. These muscles are the abductor pollicis longus (APL), extensor pollicis brevis (EPB), and extensor pollicis longus (EPL) and they are collectively referred to as the "outcropping" muscles. Additionally, a fourth muscle in the hand called the abductor pollicis brevis (APB) also assists in creating this classic movement.
Anatomical variants in any of these four muscles may be important for understanding the etiology, diagnosis, and treatment of several conditions, including de Quervain's tenosynovitis and intersection syndrome.
Description
UB RISE 2023, College of Health Sciences, School of Chiropractic, University of Bridgeport.