palmaris longus

noun
palmaris lon·​gus | \-ˈlȯŋ-gəs \

Medical Definition of palmaris longus 

: a superficial muscle of the forearm lying on the medial side of the flexor carpi radialis that arises especially from the medial epicondyle of the humerus, inserts especially into the palmar aponeurosis, and acts to flex the hand

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