flexor digitorum profundus (muscle)

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flex·or di·gi·to·rum pro·fun·dus (mus·cle)

muscle of deep layer of anterior (flexor) compartment of forearm; origin, anterior surface of proximal third of ulna; insertion, by four tendons, piercing those of the flexor digitorum superficialis, into anterior aspect of the base of distal phalanx of each finger; action, flexes distal interphalangeal joint of fingers; nerve supply, ulnar and median (anterior interosseous muscle).
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