Muscle Atlas

Opponens Pollicis

Origin: Flexor retinaculum and tubercles of scaphoid and trapezium
Insertion: Lateral side of 1st metacarpal
Action: Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially
Innervation: Recurrent branch of median nerve (C8 and T1)
Arterial Supply: Superficial palmar branch of the radial artery

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