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Dorsal Interossei 1st-4th
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Dorsal Interossei 1st-4th:
Proximal Attachment - Adjacent sides of two metacarpals
Distal Attachment - Bases of proximal phalanges; extensor expansions of 2nd-4th digits
Innervation - Deep branch of ulnar nerve
Action - Abduct 2nd-4th digits from an axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints