| Origin |
Posterior sufraces of ulna, radius and interosseous membrane
|
| Insertion |
Base of 1st metacarpal
|
| Action |
Abducts thumb and extends it at carpometacarpal joint
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| Innervation |
Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve
|
Arterial
Supply |
Posterior interosseous artery
|
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