Extensor digitorum muscle Origin lateral epicondyle (common extensor tendon) Insertion extensor expansion of middle and distal phalanges of the 2nd, 3rd, 4th, and 5th fingers[1] Artery posterior interosseous artery Nerve radial nerve Actions extension of hand, wrist and fingers Antagonist Flexor digitorum superficialis muscle, Flexor digitorum profundus muscle