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 sheaths of the tendons on the back of the wrist. (Abductor pollicis longus and brevis visible at center right, going into thumb.)
Origin = ulna, radial styloid process
Insertion = first metacarpal
Action = abduction, extension of thumb
Antagonist = Adductor pollicis muscle
Blood =
Nerve = Posterior interosseous nerve
DorlandsPre = m_22
DorlandsSuf = 12548315
The Abductor pollicis longus lies immediately below the Supinator and is sometimes united with it.

Origin and insertion

It arises from the lateral part of the dorsal surface of the body of the ulna below the insertion of the Anconæus, from the interosseous membrane, and from the middle third of the dorsal surface of the body of the radius.

Passing obliquely downward and lateralward, it ends in a tendon, which runs through a groove on the lateral side of the lower end of the radius, accompanied by the tendon of the Extensor pollicis brevis, and is inserted into the radial side of the base of the first metacarpal bone.

It occasionally gives off two slips near its insertion: one to the greater multangular bone and the other to blend with the origin of the Abductor pollicis brevis.

Action

The chief action of abductor pollicis longus is to abduct the thumb at its CMC joint, thereby advancing the 1st digit anterior relative to the palm of the hand.

By its continued action it helps to extend and abduct the wrist.

Variations

More or less doubling of muscle and tendon with insertion of the extra tendon into the first metacarpal, the greater multangular, or into the Abductor pollicis brevis or Opponens pollicis.

See also

* Anatomical snuffbox
* Extensor pollicis longus


=Additional

External links

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


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