Updated: 10/19/2017

Extensor Pollicis Brevis

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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 and C8), the continuation of the deep branch of the radial nerve (C7, C8)
Arterial Supply Posterior interosseous artery
   
Clinical Relevance De Quervain's Tenosynovitis

   
 

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