Muscle Atlas

Interosseous Muscles, Dorsal

Origin: Dorsal 1 - 4: Adjacent sides of two metacarpals (bipennate muscles)
Insertion: Dorsal 1 - 4: Extensor expansions and bases of proximal phalanges of digits 2 - 4
Action: Dorsal 1 - 4: Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints
Innervation: Deep branch of ulnar nerve (C8 and T1)
Arterial Supply: Dorsal 1 - 4: Dorsal and palmar metacarpal arteries

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