Extensor digitorum muscle
The extensor digitorum muscle (also known as extensor digitorum communis) is a muscle of the posterior forearm present in humans and other animals. It extends the medial four digits of the hand. Extensor digitorum is innervated by the posterior interosseous nerve, which is a branch of the radial nerve.
| Extensor digitorum muscle | |
|---|---|
Posterior surface of the forearm. Superficial muscles. Extensor digitorum muscle is labeled in purple. | |
Transverse section across the wrist and digits. (Ext. dig. communis labeled at bottom center.) | |
| Details | |
| Origin | lateral epicondyle (common extensor tendon) |
| Insertion | extensor expansion of middle and distal phalanges of the 2nd, 3rd, 4th, and 5th fingers |
| Artery | posterior interosseous artery |
| Nerve | posterior interosseous nerve |
| Actions | extension of hand, wrist and fingers |
| Antagonist | Flexor digitorum superficialis muscle, Flexor digitorum profundus muscle |
| Identifiers | |
| Latin | musculus extensor digitorum |
| TA98 | A04.6.02.042 |
| TA2 | 2500 |
| FMA | 38500 |
| Anatomical terms of muscle | |
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