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Updated: Dec 31 2021

Dorsal interossei

4.8

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(5)

Images
https://upload.orthobullets.com/topic/10049/images/4b8d281c-0c2a-43b8-9f51-48b5d387a75d_di..jpg
  • 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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