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opposer muscle of thumb --> opponens pollicis

(Science: anatomy, muscle) origin, ridge of trapezium and flexor retinaculum; insertion, anterior surface of the full length of the shaft of the first metacarpal bone; action, acts at carpometacarpal joint to cup palm, enabling one to oppose thumb to other fingers; nerve supply, median.

Synonym: musculus opponens pollicis, opposer muscle of thumb.