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Extensor Carpi Ulnaris (ECU)
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Extensor Carpi Ulnaris (ECU):
Proximal Attachment - Lateral epicondyle of humerus; posterior border of ulna via a shared aponeurosis
Distal Attachment - Dorsal aspect of base of 5th metacarpal
Innervation - Deep branch of radial nerve
Action - Extends and adducts hand at wrist joint