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 |
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| 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) |