- Flexor pollicis longus muscle
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)
Origin = The middle 2/4 of the
volarsurface of the radiusand the adjacent interosseus membrane. (Also occasionally a small origin slightly on the medial epicondyleof the ulna.)
Insertion = The base of the
distal phalanxof the thumb
Flexionof the thumb.
Extensor pollicis longus muscle, Extensor pollicis brevis muscle
Anterior interosseus artery
Anterior interosseous nerve(branch of median nerve) (C8, T1)
DorlandsPre = m_22
DorlandsSuf = 12549138
The flexor pollicis longus is a muscle in the
forearmand handthat 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. [Straus, W. L. (1942). Rudimentary digits in primates. Q. Rev. Biol. 17, 228–243. ]
Origin and insertion
It arises from the grooved anterior surface of the body of the
radius, extending from immediately below the tuberosity and oblique line to within a short distance of the pronator quadratusmuscle.
It arises also from the adjacent part of the
interosseous membrane of the forearm, and generally by a fleshy slip from the medial border of the coronoid processof the ulna, or from the medial epicondyleof the humerus.
The fibers end in a flattened tendon, which passes beneath the
flexor retinaculum of the handthrough the carpal tunnel. It is then lodged between the lateral head of the flexor pollicis brevisand the oblique part of the adductor pollicis, and, entering an osseoaponeurotic canal similar to those for the flexor tendons of the fingers, is inserted into the base of the distal phalanx of the thumb.
anterior interosseous nerve(a branch of the median nerve) and the anterior interosseous arteryand vein pass downward on the front of the interosseous membrane between the flexor pollicis longus and flexor digitorum profundus.Injuries to tendons are particularly difficult to recover from due to the limited blood supply they receive.
The flexor pollicis longus is a flexor of the phalanges of the thumb; when the thumb is fixed, it assists in flexing the wrist.
Slips may connect with
flexor digitorum superficialis, flexor digitorum profundus, or the pronator teres. An additional tendon to the index finger is sometimes found.
* [http://www.ptcentral.com/muscles/musclearms.html#flexor%20pollicis%20longus PTCentral]
Wikimedia Foundation. 2010.
Look at other dictionaries:
flexor pollicis longus muscle — musculus flexor pollicis longus … Medical dictionary
Flexor pollicis brevis muscle — Muscle infobox Name = Flexor pollicis brevis muscle Latin = musculus flexor pollicis brevis GraySubject = 126 GrayPage = 461 Caption = The muscles of the left hand. Palmar surface. (Flexor pollicis brevis visible at center right, near thumb.)… … Wikipedia
flexor pollicis longus — n a muscle of the radial side of the forearm that flexes esp. the second phalanx of the thumb … Medical dictionary
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… … Wikipedia
musculus flexor pollicis longus — [TA] long flexor muscle of thumb: origin, anterior surface of radius, interosseous membrane, and medial epicondyle of humerus or coronoid process of ulna; insertion, base of distal phalanx of thumb; innervation, anterior interosseous; action,… … Medical dictionary
Flexor digitorum superficialis muscle — Flexor digitorum superficialis Transverse section across distal ends of radius and ulna. (Flexor dig. subliminis labeled at center top.) Latin musculus flexor digitorum superficialis … Wikipedia
Pollicis longus — may refer to:*Flexor pollicis longus muscle *Extensor pollicis longus muscle … Wikipedia
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 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
Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… … Medical dictionary