Extensor Digitorum Communis (EDC) Anatomy

Origin: Humerus (lateral epicondyle via common extensor tendon)

Intermuscular septum

Antebrachial fascia

Insertion: Four tendons to digits 2-5 (via the extensor expansion, to dorsum of middle and distal phalanges; one tendon to each finger)

Innervation: Cervical root(s): C7 and C8

Nerve: radial nerve (posterior interosseous branch)