Updated: 12/28/2021

Extensor Pollicis Brevis

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  • Summary
    • Extensor Pollicis Brevis
      Origin
      Posterior surfaces of radius and interosseous membrane
      Insertion
      Base of proximal phalanx of thumb
      Action
      Extends proximal phalanx of thumb at metacarpophalangeal joint
      Innervation
      Posterior interosseous nerve (C7, C8)
      Arterial Supply
      Posterior interosseous artery

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