| Muscle Function & Other Pertinent Medical Information | | DORSAL INTEROSSEI
| | ORIGIN
Bipennate from inner aspects of shafts of all metacarpals
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| INSERTION
Proximal phalanges and dorsal extensor expansion on radial side of index and middle fingers and ulnar side of middle and ring fingers
|
| ACTION
Abduct from axis of middle finger. Flex metacarpophalangeal joint while extending interphalangeal joints
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| NERVE
Deep branch of ulnar nerve (T1)
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