palmaris longus (muscle)
Definition: muscle of superficial layer of anterior (flexor) compartment of forearm; origin, medial epicondyle of humerus; insertion, flexor retinaculum of wrist and palmar fascia; action, tenses palmar fascia and flexes the hand and forearm; is absent about 20% of the time; when tensed, its tendon stands out sharply at the wrist and overlies the median nerve; nerve supply, median.
Synonym(s): musculus palmaris longusTA, long palmar muscle
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