FLEXOR POLLICIS BREVIS
| ORIGIN Flexor retinaculum and tubercle of trapezium |
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| INSERTION Base of proximal phalanx of thumb (via radial sesamoid) |
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| ACTION Flexes metacarpophalangeal joint of thumb |
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| NERVE Recurrent (muscular) branch of median nerve (C8, T1) (may also be from deep branch of ulnar nerve (T1)) |