The extensor carpi radialis longus is one of the muscles of the superficial layer of the posterior compartment of the forearm.
The posterior compartment of the forearm consists of a superficial layer (7 muscles) and a deep layer (5 muscles).
The muscles in the superficial layer include:
- Brachioradialis
- Extensor carpi radialis longus
- Extensor carpi radialis brevis
- Extensor digitorum
- Extensor digiti minimi
- Extensor carpi ulnaris
- Anconeus
The muscles of the superficial layer share a common origin from the lateral epicondyle and lateral supracondylar ridge of the humerus.
All the muscles of the posterior compartment are innervated by the radial nerve.
Origin |
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Insertion |
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Innervation |
Other than the brachioradialis, the rest of the muscles of the superficial layer of the posterior compartment of the forearm are innervated by the posterior interosseus branch of the radial nerve: extensory carpi radialis brevis, extensor digitorum, extensor digiti minimi and extensor carpi ulnaris. |
Blood Supply | Radial artery |
Antagonist | Flexor carpi ulnaris muscle |
Action |
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