Updated: 1/1/2022

Extensor Pollicis Longus

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  • Summary
    • Extensor Pollicis Longus
      Origin
      Posterior surface of middle 1/3 of ulna and interosseous membrane
      Insertion
      Base of distal phalanx of thumb
      Action
      Extends distal phalanx of thumb at metacarpophalangeal and interphalangeal joints
      Innervation
      Posterior interosseous nerve (C7, C8)
      Arterial supply
      Posterior interosseous artery

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