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opponens pollicis (muscle)


Definition: thenar muscle of palm; origin, ridge of trapezium and transverse carpal ligament (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(s): musculus opponens pollicisTA, opposer (muscle) of thumb

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.