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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