Extensor Carpi Radialis Longus is, as the name suggests, the longer of the two extensor carpi radialis muscles as its origin is the ridge above the lateral epicondyle of the humerus, unlike the other wrist extensors which attach to the epicondyle itself.
Origin - Lateral supracondylar ridge of the humerus.
Insertion - Base of the 2nd metacarpal (dorsal side).
Actions - Extension of the wrist.
Radial deviation (abduction) of the wrist.
Innervation - Radial nerve.
Daily uses - Typing.
Example stretches - Wrist extensor stretch.
Example strengthening exercise - Wrist extension using a dumbbell.
Related injuries - Tennis elbow.
Related muscles - Extensor carpi radialis brevis.
Extensor carpi ulnaris.