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Updated: 12/31/2021

Palmar interossei

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  • Summary
      • Palmar interossei (3 muscles)
      • Origin
      • Palmar surfaces of 2nd, 4th and 5th metacarpals (3 unipennate muscles)
      • Insertion
      • Extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5
      • Action
      • Adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
      • Innervation
      • Deep branch of ulnar nerve (C8, T1)
      • Arterial supply
      • Palmar metacarpal arteries

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