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Extensor Carpi Radialis Longus

Last updated on Monday, April 20 2009 by blondarb

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Muscle Name: extensor carpi radialis longus

AKA:  

Abbreviation:  

Spinal Nerve Roots:
    C5
    C6
    C7

Brachial Plexus Trunks:
    upper trunk
    middle trunk

Brachial Plexus Cords:
    posterior cord

Named Nerves:
    radial nerve

Proximal Attachment:  Lateral supracondylar ridge

Distal Attachment:  2nd metacarpal

Action:  Extensor at the wrist joint, abducts the hand at the wrist.

Needle Insertion:  In the pronated forearm, 1 cm distal to the lateral epicondyle.

Activation for EMG: Extend the wrist. 

Pitfalls:  

Notes:  This is the only forearm extensor spared in a posterior interosseous nerve entrapment.