abductor pollicis longus muscle

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abductor pollicis longus muscle

A long hand muscle that abducts the thumb, which arises from the dorsolateral surface of the ulna.
 
Action
Moves thumb anteriorly (from anatomic position of the body in space) toward the base of the fifth finger.

Critical for
Thumb manoeuvrability, precision and power grip.

Nerve
Posterior interosseous nerve—a continuation of the deep branch of the radial nerve.

Origin
Lateral dorsal surface of the body of the ulna below the anconeus insertion, from the interosseous membrane, and the middle third of the dorsal surface of the body of the radius.

Insertion
Radial side of the base of the first metacarpal bone.

ab·duc·tor pol·li·cis long·us mus·cle

(ab-dŭk'tŏr pol'li-sis long'gŭs mŭs'ĕl)
Outcropping muscle of posterior compartment of forearm; origin, interosseous membrane and posterior surfaces of radius and ulna; insertion, lateral side of base of first metacarpal bone; action, abducts and assists in extending thumb; nerve supply, radial.
Synonym(s): long abductor muscle of thumb, musculus abductor pollicis longus, musculus extensor ossis metacarpi pollicis.
References in periodicals archive ?
Abductor pollicis longus transfer for replacement of first dorsal interosseous.
"Suspension plasty": Trapeziometacarpal joint reconstruction using abductor pollicis longus. Oper Tech Orthop.
Dorsal view of the forearm and the interspace between extensor digitorum and extensor carpi radialis brevis are unclear at middle segments and proximal parts of forearm, but gradually became evident at the distal parts of forearm; whereas abductor pollicis longus and extensor pollicis brevis emerged superficially from the interspace between extensor digitorum and extensor carpi radialis brevis at the 1/3 juncture of the middle and distal segments of forearm, thereby indicating extensor carpi radialis brevis and extensor digitorum and abductor pollicis longus.
et al (1) in 1988 have seen the APL tendon to divided in three slips, Mehta V et al (5) in (2009) observed the quadruplicate arrangement of abductor pollicis Longus tendon and found 3 slips of APL.
1= ex- tensor carpi radialis longus muscle; 2= ex- tensor carpi radialis brevis muscle; 3= tendon of the extensor carpi radialis longus muscle; 4= tendon of the extensor carpi radialis brevis muscle; 5= abductor pollicis longus muscle.
(3,4) It is usually caused by overuse or an increase in repetitive activity, resulting in shear microtrauma from repetitive gliding of the first dorsal compartment tendons (abductor pollicis longus or APL, and extensor pollicis brevis or EPB) beneath the sheath of the first compartment over the styloid of the radius leading to thickening of the extensor retinaculum of the wrist (and not related to inflammation as was once thought).
The extrinsic musculature of the thumb consists of the flexor pollicis longus (FPL), innervated by the anterior interosseous nerve, and the extensor pollicis longus (EPL), extensor pollicis brevis (EPB), and the abductor pollicis longus (APL), all innervated by the posterior interosseous nerve.
1), is laterally limited by the tendons of abductor pollicis longus and extensor pollicis brevis muscles, and medially limited by the tendon of extensor pollicis longus muscle (Latarjet & Ruiz-Liard).
After passing deep to the abductor pollicis longus and extensor carpi radialis brevis the radial artery reaches the anatomical snuff box where its become a content of it.
Restoration of pinch grip in ulnar nerve paralysis: extensor carpi radialis longus to adductor pollicis and abductor pollicis longus to first dorsal interosseus tendon transfers.
The origins of the extensor indicis, extensor pollicis longus, extensor pollicis brevis, abductor pollicis longus, flexor pollicis longus, and flexor digitorum profundus were digitized from 11 cadavers.