Summary Extensor Indicis Proprius Origin Posterior surface of ulna and interosseous membrane Insertion Extensor expansion of 2nd digit Action Extends 2nd digit and helps to extend the hand Innervation Posterior interosseous nerve (C7, C8) Arterial supply Posterior interosseous artery
Extensor Indicis Proprius summary OBC What is the origin? Origin Posterior surface of ulna and interosseous membrane Show Bullets