PALMAR INTEROSSEI
| ORIGIN Anteriorshafts of 2, 4, 5 metacarpals (unipennate) |
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| INSERTION Proximal phalanges and dorsal extensor expansion on ulnar side of index and radial side of ring and little fingers and to ulnar sesamoid of thumb |
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| ACTION Adduct to axis of middle finger. Flex metacarpophalangeal joint while extending interphalangeal joints |
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| NERVE Deep branch of ulnar nerve (T1) |