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abductor pollicis longus

   Also found in: Acronyms, Wikipedia 0.01 sec.
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.


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There was evidence of synovitis in the intercarpal joints and tenosynovitis of the extensor pollicis brevis (Figure 3) and the abductor pollicis longus.
The pull of the adductor pollicis causes the distal portion of the thumb to displace toward the palm, while the base of the joint displaces in the opposite direction due to the pull of the abductor pollicis longus (Fig.
 
 
 
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