FLEXOR DIGITORUM PROFUNDUS
| ORIGIN Medial olecranon, upper three quarters of anterior and medial surface of ulna as far round as subcutaneous border and narrow strip of interosseous membrane |
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| INSERTION Distal phalanges of medial four fingers. Tendon to index finger separates early |
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| ACTION Flexes distal interphalangeal joints, then secondarily flexes proximal interphalangeal and metacarpophalangeal joints and wrist |
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| NERVE Median nerve (anterior interosseous) and ulnar nerve |