Muscle Atlas

Extensor Digitorum

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
Arterial Supply: Interosseous recurrent and posterior interosseous arteries

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