“Extensor pollicis brevis muscle”的意思、由来-开放百科全书

词条

Extensor pollicis brevis muscle

释义

Structure
Variation
Function
Additional images
References
Sources
External links

{{More footnotes|article|date=May 2015}}{{Infobox muscle
| Name = Extensor pollicis brevis muscle
| Latin = musculus extensor pollicis brevis
| Image = Gray1231.png
| Caption = Front of right upper extremity. (Extensor pollicis brevis labeled at upper left.)
| Image2 = Musculusextensorpollicisbrevis.png
| Caption2 = Posterior surface of the forearm. Deep muscles. (Extensor pollicis brevis visible at left.)
| Origin = radius and the interosseous membrane
| Insertion = thumb, proximal phalanx
| Action = extension of thumb at metacarpophalangeal joint
| Antagonist = Flexor pollicis longus muscle, Flexor pollicis brevis muscle
| Blood = posterior interosseous artery
| Nerve = posterior interosseous nerve
}}

In human anatomy, the extensor pollicis brevis is a skeletal muscle on the dorsal side of the forearm. It lies on the medial side of, and is closely connected with, the abductor pollicis longus.

Structure

The extensor pollicis brevis arises from the ulna distal to the abductor pollicis longus, from the interosseous membrane, and from the dorsal surface of the radius.

^[1]

Its direction is similar to that of the abductor pollicis longus, its tendon passing the same groove on the lateral side of the lower end of the radius, to be inserted into the base of the first phalanx of the thumb.

Variation

Absence; fusion of tendon with that of the extensor pollicis longus.

Function

In a close relationship to the abductor pollicis longus, the extensor pollicis brevis both extends and abducts the thumb^[1] at the carpometacarpal and metacarpophalangeal joints.^[2]

Additional images

{{Cleanup-gallery anatomy|date=May 2015}}{{gallery
| height = 150|width=150|lines=4
|File:Anatomical-snuff-box.jpg|Anatomical snuff box
|File:Gray214.png|Bones of left forearm. Posterior aspect.
|File:Gray220.png|Bones of the left hand. Dorsal surface.
|File:Gray416.png|Tendons of forefinger and vincula tendina.
|File:Gray421.png|Transverse section across distal ends of radius and ulna.
|File:Gray422.png|Transverse section across the wrist and digits.
|File:Gray424.png|The mucous sheaths of the tendons on the back of the wrist.
|File:Gray527.png|The radial and ulnar arteries.
|File:Gray529.png|Arteries of the back of the forearm and hand.
|File:Forearm posterior view.jpg|Extensor carpi radialis brevis muscle
|File:Slide2RRRRR.JPG|Extensor pollicis brevis muscle
|File:Slide9RRRRR.JPG|Extensor pollicis brevis muscle
|File:Slide2SSSS.JPG|Extensor pollicis brevis muscle
|File:Slide8SSSS.JPG| Extensor pollicis brevis muscle
|File:Slide4TTTT.JPG|Extensor pollicis brevis muscle
|File:Slide7TTTT.JPG|Extensor pollicis brevis muscle
|File:Slide12TTTT.JPG|Extensor pollicis brevis muscle
|File:Slide2TAT.JPG|Muscle of the hand.Posterior view.
}}

References

1. ^¹{{harvnb|Platzer|2004| p=168}}
2. ^{{cite web| title = Thumb Articulations| publisher = ExRx.net| url = http://www.exrx.net/Articulations/Thumb.html| accessdate = June 2010}}

Sources

{{cite book | ref = harv | last = Platzer | first = Werner

| title = Color Atlas of Human Anatomy, Vol. 1: Locomotor System
| publisher = Thieme | isbn = 3-13-533305-1
| year = 2004 | edition = 5th
}}

External links

[https://web.archive.org/web/20120204112837/http://www.ptcentral.com/muscles/musclearms.html#extensor%20pollicis%20brevis PTCentral]

1 : Muscles of the upper limb

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