Extensor Pollicis Longus: Difference between revisions
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== Description == | == Description == | ||
Extensor pollicis longus (EPL) is a long [[muscle]] located at the deep layer with [[Extensor Pollicis Brevis|extensor pollicis brevis]], [[abductor pollicis longus]], [[Extensor Indicis|extensor indicis]], and [[Supinator|supinator muscle]] in the posterior compartment of the forearm. | [[File:Extensor pollicis longus.png|thumb]] | ||
Extensor pollicis longus (EPL) is a long [[muscle]] located at the deep layer with [[Extensor Pollicis Brevis|extensor pollicis brevis]], [[abductor pollicis longus]], [[Extensor Indicis|extensor indicis]], and [[Supinator|supinator muscle]] in the posterior compartment of the forearm.<ref>Moore KL, Dalley AF, Agur AM. Clinically oriented anatomy. 7th ed. Baltimore, MD: Lippincott Williams & Wilkins, 2014.</ref> It originates from the mid-third of the [[ulna]], and interosseous membrane then courses down to the distal phalanx of the thumb. Though it is situated at the forearm, it is classified as part of the extrinsic muscles of the [[Hand Function|hand]] as it's function is seen in thumb movement.<ref>Drake RL, Vogl W, Mitchell AW, Gray H. Gray's anatomy for Students 2nd edition. Philadelphia : Churchill Livingstone/Elsevier, 2010.</ref> | |||
=== Origin === | === Origin === | ||
It originates from the mid-third of the [[ulna]], and interosseous membrane | |||
=== Insertion === | === Insertion === | ||
It inserts at the base of distal phalanx of thumb via Lister's tubercle; that is the dorsal tubercle of radius. | |||
=== Nerve === | === Nerve === | ||
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== Function == | == Function == | ||
* The EPL mainly hyper-/extends the interphalangeal joint of the distal phalanx of the thumb. | * The EPL mainly hyper-/extends the interphalangeal joint of the distal phalanx of the thumb.<ref>Wikipedia. 2019. Available from:https://en.wikipedia.org/wiki/Extensor_pollicis_longus_muscle (accessed 10 October 2020)</ref> | ||
* It also serves as accessory extensors of the metacarpophalangeal of the proximal phalanx and carpometacarpal joints of the first metacarpal. | * It also serves as accessory extensors and adductors of the metacarpophalangeal of the proximal phalanx and carpometacarpal joints of the first metacarpal.<ref>Khan I. Anatomy, Shoulder and Upper Limb, Hand Extensor Pollicis Longus Muscle. In: Varacallo M. editor. Statpearls, 2020. Available from:https://www.statpearls.com/articlelibrary/viewarticle/36135/ (accessed 10 October 2020)</ref> | ||
* It may also assist in wrist joint extension. | * It may also assist in wrist joint extension.<ref>KenHub. Available from:https://www.kenhub.com/en/library/anatomy/extensor-pollicis-longus-muscle (accessed 10 October 2020)</ref> | ||
== Clinical relevance == | == Clinical relevance == | ||
Revision as of 18:03, 10 October 2020
Original Editor - Uchechukwu Chukwuemeka
Top Contributors - Uchechukwu Chukwuemeka, Kim Jackson, Shaimaa Eldib and Aya Alhindi
This article or area is currently under construction and may only be partially complete. Please come back soon to see the finished work! (10/10/2020)
Description[edit | edit source]
Extensor pollicis longus (EPL) is a long muscle located at the deep layer with extensor pollicis brevis, abductor pollicis longus, extensor indicis, and supinator muscle in the posterior compartment of the forearm.[1] It originates from the mid-third of the ulna, and interosseous membrane then courses down to the distal phalanx of the thumb. Though it is situated at the forearm, it is classified as part of the extrinsic muscles of the hand as it's function is seen in thumb movement.[2]
Origin[edit | edit source]
It originates from the mid-third of the ulna, and interosseous membrane
Insertion[edit | edit source]
It inserts at the base of distal phalanx of thumb via Lister's tubercle; that is the dorsal tubercle of radius.
Nerve[edit | edit source]
It is innervated by the deep branch of the radial nerve via the posterior interosseous nerve (7th and 8th cervical nerve root).[3]
Artery[edit | edit source]
Function[edit | edit source]
- The EPL mainly hyper-/extends the interphalangeal joint of the distal phalanx of the thumb.[4]
- It also serves as accessory extensors and adductors of the metacarpophalangeal of the proximal phalanx and carpometacarpal joints of the first metacarpal.[5]
- It may also assist in wrist joint extension.[6]
Clinical relevance[edit | edit source]
Tenosynovitis is a relatively common inflammatory irritation of the synovial sheath, after repetitive activities such as playing drum.
Assessment[edit | edit source]
Treatment[edit | edit source]
Resources[edit | edit source]
- ↑ Moore KL, Dalley AF, Agur AM. Clinically oriented anatomy. 7th ed. Baltimore, MD: Lippincott Williams & Wilkins, 2014.
- ↑ Drake RL, Vogl W, Mitchell AW, Gray H. Gray's anatomy for Students 2nd edition. Philadelphia : Churchill Livingstone/Elsevier, 2010.
- ↑ Department of Radiology; University of Washington. Available from: https://rad.washington.edu/muscle-atlas/extensor-pollicis-longus/ (accessed 10 October 2020)
- ↑ Wikipedia. 2019. Available from:https://en.wikipedia.org/wiki/Extensor_pollicis_longus_muscle (accessed 10 October 2020)
- ↑ Khan I. Anatomy, Shoulder and Upper Limb, Hand Extensor Pollicis Longus Muscle. In: Varacallo M. editor. Statpearls, 2020. Available from:https://www.statpearls.com/articlelibrary/viewarticle/36135/ (accessed 10 October 2020)
- ↑ KenHub. Available from:https://www.kenhub.com/en/library/anatomy/extensor-pollicis-longus-muscle (accessed 10 October 2020)
This article or area is currently under construction and may only be partially complete. Please come back soon to see the fi
