Extensor Digitorum Communis (EDC) Anatomy
Origin: Humerus (lateral epicondyle via common extensor tendon), Intermuscular septum, and 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)
Diagrams & Photos
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Extensor Digitorum Communis (EDC)
Videos
Extensor Digitorum Communis (EDC)
Key Points
- EDC extends the index, long, ring, and little fingers simultaneously.
- The EDC tendons simultaneously extend the digits because of a single muscle belly and extension quadriga.