abductor pollicis brevis


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abductor pollicis brevis

one of the three thenar muscles. It abducts the thumb, principally at the metacarpophalangeal joints.
References in periodicals archive ?
Fibrillation and positive sharp waves were seen in the abductor pollicis brevis muscles bilaterally.
Physical examination revealed proximal muscle weakness of the upper and lower limbs (muscle test 3/5), and weakness of the distal muscles of both hands, in the abductor pollicis brevis, opponens pollicis, flexor pollicis and the first and second lumbricals particularly.
Bilateral median motor nerve conduction studies on the wrist-elbow segment recording from the abductor pollicis brevis (APB) muscle, and bilateral ulnar motor nerve conduction studies on the wrist-elbow, across elbow, elbow-axilla and the axilla-erb segments recording from the abductor digiti minimi (ADM) muscle were done using superficial electrodes.