abductor pollicis longus


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abductor pollicis longus

a muscle that originates from the proximal posterior surfaces of the radius and ulna and from the related interosseous membrane and forms a tendon that passes into the thumb and inserts on the lateral side of the base of the first metacarpal. Its major function is to abduct the thumb at the joint between the first metacarpal and trapezium bones.
References in periodicals archive ?
11) In supination, the dorsal expansion of the abductor pollicis longus (APL) is the major stabilizer of the basal joint.
Abductor pollicis longus tendon arthroplasty for treatment of arthrosis in the first carpometacarpal joint.
The flexor pollicis longus, the extensor pollicis longus, and the abductor pollicis longus usually supply the necessary stability.