| Origin |
Lateral epicondyle of humerus
|
| Insertion |
Extensor expansions of medial four digits
|
| Action |
Extends medial four digits at metacarpophalangeal joints;
Extends hand at wrist joint
|
| Innervation |
Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve
|
Arterial
Supply |
Interosseous recurrent and posterior interosseous arteries
|
