Updated: 10/19/2017

Extensor Digitorum

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Origin Lateral epicondyle of humerus
Insertion Extensor expansions of medial four digits
Action Extends medial four digits at metacarpophalangeal joints; Extends hand at wrist joint
Innervation Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8)
Arterial Supply Interosseous recurrent and posterior interosseous arteries

   

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