Flexor pollicis longus muscle
Flexor pollicis longus muscle | |
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Identifiers | |
Latin | musculus flexor pollicis longus |
TA98 | A04.6.02.037 |
TA2 | 2492 |
FMA | 38481 |
Anatomical terms of muscle] |
The flexor pollicis longus (/ˈflɛksər ˈpɒlɪsɪs ˈlɒŋɡəs/; FPL, Latin flexor, bender; pollicis, of the thumb; longus, long) is a muscle in the forearm and hand that flexes the thumb. It lies in the same plane as the flexor digitorum profundus. This muscle is unique to humans, being either rudimentary or absent in other primates.[1] A meta-analysis indicated accessory flexor pollicis longus is present in around 48% of the population.[2]
Human anatomy
Origin and insertion
It arises from the grooved anterior (side of palm) surface of the body of the
It arises also from the adjacent part of the
The fibers end in a flattened
Relations
The anterior interosseous nerve (a branch of the median nerve) and the anterior interosseous artery and vein pass downward on the front of the interosseous membrane between the flexor pollicis longus and flexor digitorum profundus.[4]
Injuries to tendons are particularly difficult to recover from due to the limited blood supply they receive.
Actions
The flexor pollicis longus is a flexor of the phalanges of the thumb; when the thumb is fixed, it assists in flexing the wrist.[4]
Innervation
The flexor pollicis longus is supplied by the anterior interosseous(C8-T1) branch of the median nerve (C5-T1).[7][8]
Variations
Slips may connect with
Evolutionary variation
Modern humans are unique among
Additional images
This gallery of anatomic features needs cleanup to abide by the medical manual of style. ; please improve or remove the gallery accordingly. (May 2015) |
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Bones of left forearm. Anterior aspect.
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Bones of the left hand. Volar surface.
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Cross-section through the middle of the forearm.
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Transverse section across distal ends of radius and ulna.
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Transverse section across the wrist and digits.
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The mucous sheaths of the tendons on the front of the wrist and digits.
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The muscles of the left hand. Palmar surface.
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Ulnar and radial arteries. Deep view.
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Nerves of the left upper extremity.
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Flexor pollicis longus muscle
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Flexor pollicis longus muscle
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Flexor pollicis longus muscle
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Flexor pollicis longus muscle
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Flexor pollicis longus muscle
References
This article incorporates text in the public domain from page 449 of the 20th edition of Gray's Anatomy (1918)
- S2CID 85312042.
- PMC 8968234.
- ISBN 978-1-4160-4083-5.
- ^ a b c d e f Gray 1918, Flexor Pollicis Longus, paras 20, 25
- ^ PMID 27069404.
- ^ Platzer 2004, p 162
- PMID 25435036.
- ^ Preston DC, Shapiro BE (2013-01-01). "Chapter 18: Proximal Median Neuropathy". In Preston (ed.). Electromyography and Neuromuscular Disorders (Third ed.). pp. 289–297.
- PMID 10904829.
- ^ PMID 18380869.
Further reading
- Gray H (1918). "The Muscles and Fasciæ of the Forearm". Gray's Anatomy of the Human Body. Archived from the original on 2012-01-23. Retrieved 2009-12-31.
- Platzer W (2004). Color Atlas of Human Anatomy, Vol. 1: Locomotor System (5th ed.). ISBN 3-13-533305-1.
- Tocheri MW, Orr CM, Jacofsky MC, PMID 18380869.