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M. adductor pollicis
the two-headed thumb adductor lying with one head in the thenar
Origin: caput transversum (sometimes also referred to as adductor pollicis transversum): os metacarpale III over its entire length; caput obliquum: adjacent carpal bones
Attachment: ulnar sesamoid bone of the metacarpophalangeal joint of the thumb
Antagonists:
Movement: extension in the metacarpophalangeal joint of the thumb and adduction of the same, participation in opposition