Flexor Pollicis Longus: Difference between revisions
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== Description == | == Description == | ||
The flexor pollicis longus (FPL) is a long [[muscle]] located at the deep layer with [[Flexor Digitorum Profundus|flexor digitorum profundus]] and [[Pronator Quadratus|pronator quadratus]] in the anterior compartment of the forearm. Though it is situated at the forearm, it is classified as part of extrinsic muscles of the [[Hand Function|hand]] as it's function is seen in thumb movement. | The flexor pollicis longus (FPL) is a long [[muscle]] located at the deep layer with [[Flexor Digitorum Profundus|flexor digitorum profundus]] and [[Pronator Quadratus|pronator quadratus]] in the anterior compartment of the forearm. 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. | ||
=== Origin === | === Origin === | ||
Revision as of 15:11, 6 October 2020
Original Editor - Uchechukwu Chukwuemeka
Top Contributors - Uchechukwu Chukwuemeka and Kim Jackson
Description[edit | edit source]
The flexor pollicis longus (FPL) is a long muscle located at the deep layer with flexor digitorum profundus and pronator quadratus in the anterior compartment of the forearm. 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.
Origin[edit | edit source]
It originates from the mid half of the anterior surface of the radius and adjacent half of the interosseous membrane. FPL has also been found to take it's origin from medial epicondyle of the humerus, coronoid process of the Ulna, and from flexor digitorium superficialis.
In a study by Ballesteros et al.[1] the accessory head of FPL has 47.1% originating from flexor digitorium superficialis, 29.4% from epicondyle of the humerus, and 23.5% is from coronoid process of the Ulna in the forearm. Hemmady et al[2] reported that of the 66.6% accessory head of FPL found, 55.5% originates from the medial epicondyle of the humerus while 16.6% is from the coronoid process of the ulna
Insertion[edit | edit source]
The muscle forms a flattened large tendon, that courses through the carpal tunnel, crossing three joints of the hand to attach at the base of the distal phalanx.
Nerve[edit | edit source]
It is innervated by the median nerve via the anterior interosseous nerve (7th and 8th cervical nerve root).
Artery[edit | edit source]
Function[edit | edit source]
- The FPL mainly flexes interphalangeal join of the distal phalanx of the thumb.
- It also serves as accessory flexors of the metacarpophalangeal of the proximal phalanx and carpometacarpal joints of the first metacarpal.
- It may also assist in wrist joint flexion.
Clinical relevance[edit | edit source]
Assessment[edit | edit source]
Treatment[edit | edit source]
Resources[edit | edit source]
- ↑ Ballesteros DR, Forero FL, Ballesteros LE. Accessory head of the flexor pollicis longus muscle: anatomical study and clinical significance. Folia Morphol 2019;78(2):394-400.DOI: 10.5603/FM.a2018.0091
- ↑ Hemmady MV, Subramanya AV, Mehta IM. Occasional head of flexor pollicis longus muscle: a study of its morphology and clinical significance. Journal of Postgraduate Medicine. 1993; 39(1):14-6
