Updated: 2/12/2018

Extensor Indicis Proprius

Review Topic

Origin Posterior surface of ulna and interosseous membrane
Insertion Extensor expansion of 2nd digit
Action Extends 2nd digit and helps to extend hand
Innervation Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8)
Arterial Supply Posterior interosseous artery


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