Extensor Carpi Radialis Brevis
Forearm & Wrist
A common source of tennis elbow pain — its tendon origin at the lateral epicondyle becomes inflamed from repetitive wrist extension and gripping.
Function
Extends and abducts wrist
Origin
Lateral epicondyle via common extensor tendon
Insertion
Base of third metacarpal
Innervation
Deep branch of radial nerve/posterior interosseous nerve (C7-C8)