Extensor pollicis longus muscle

Extensor pollicis longus muscle

Muscle infobox
Name = Extensor pollicis longus muscle
Latin = musculus extensor pollicis longus
GraySubject = 125
GrayPage = 455


Caption = The mucous sheaths of the tendons on the back of the wrist. (Extensor pollicis longus visible at center right.)
Origin = ulna
Insertion = thumb, distal phalanx
Action = extension of the thumb (metacarpophalangeal and interphalangeal)
Antagonist = Flexor pollicis longus muscle, Flexor pollicis brevis muscle
Blood =
Nerve = posterior interosseus nerve (branching from the radial nerve)
DorlandsPre = m_22
DorlandsSuf = 12548955
The Extensor pollicis longus is much larger than the Extensor pollicis brevis muscle, the origin of which it partly covers.

Origin and insertion

It arises from the lateral part of the middle third of the dorsal surface of the body of the ulna below the origin of the Abductor pollicis longus, and from the interosseous membrane.

It ends in a tendon, which passes through a separate compartment in the dorsal carpal ligament, lying in a narrow, oblique groove on the back of the lower end of the radius.

It then crosses obliquely the tendons of the Extensores carpi radialis longus and brevis, and is separated from the Extensor pollicis brevis by a triangular interval, the anatomical snuff box in which the radial artery is found; and is finally inserted into the base of the last phalanx of the thumb.

Relations

The radial artery is crossed by the tendons of the Abductor pollicis longus and of the Extensores pollicis longus and brevis.

Action

Extensor pollicis longus extends the terminal phalanx of the thumb; in combination with the Extensor pollicis brevis, it helps to extend and abduct the wrist.


=Additional

External links

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* [http://www.ptcentral.com/muscles/musclearms.html#extensor%20pollicis%20longus PTCentral]


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См. также в других словарях:

  • extensor pollicis longus muscle — musculus extensor pollicis longus …   Medical dictionary

  • Extensor pollicis brevis muscle — Muscle infobox Name = Extensor pollicis brevis muscle Latin = musculus extensor pollicis brevis GraySubject = 125 GrayPage = 455 Caption = Front of right upper extremity. (Extensor pollicis brevis labeled at upper left.) Caption2 = Posterior… …   Wikipedia

  • extensor pollicis longus — extensor pollicis lon·gus lȯŋ gəs n a muscle that arises dorsolaterally from the middle part of the ulna, extends the second phalanx of the thumb, and abducts the hand …   Medical dictionary

  • Flexor pollicis longus muscle — Muscle infobox Name = Flexor pollicis longus muscle Latin = musculus flexor pollicis longus GraySubject = 125 GrayPage = 449 Caption = Front of the left forearm. Deep muscles. (Flexor pollicis longus is shown in blue) Caption2 = Origin = The… …   Wikipedia

  • Abductor pollicis longus muscle — Muscle infobox Name = Abductor pollicis longus muscle Latin = musculus abductor pollicis longus GraySubject = 125 GrayPage = 455 Caption = Front of right upper extremity. (Abductor pollicis longus labeled at upper left.) Caption2 = The mucous… …   Wikipedia

  • musculus extensor pollicis longus — [TA] long extensor muscle of thumb: origin, posterior surface of ulna and interosseous membrane; insertion, base of distal phalanx of thumb; innervation, posterior interosseous; action, extends thumb, adducts and rotates thumb laterally …   Medical dictionary

  • Extensor carpi ulnaris muscle — Extensor carpi ulnaris Posterior surface of the forearm. Extensor carpi ulnaris labeled in purple at center right. Latin musculus extensor carpi ulnaris …   Wikipedia

  • Extensor pollicis muscle — may refer to:*Extensor pollicis longus muscle *Extensor pollicis brevis muscle …   Wikipedia

  • Pollicis longus — may refer to:*Flexor pollicis longus muscle *Extensor pollicis longus muscle …   Wikipedia

  • Extensor carpi radialis longus muscle — Muscle infobox Name = Extensor carpi radialis longus Latin = musculus extensor carpi radialis longus GraySubject = 125 GrayPage = 452 Caption = Superficial muscles of the foreamr. Extensor carpi radialis longus visible in blue. Caption2 =… …   Wikipedia


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