Updated: 12/31/2021

Dorsal interossei

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

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