Main Model
29 Extensor carpi ulnaris muscle
Extensor carpi ulnaris
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 (C7, C8)
Main Action(s): Extends and adducts hand at wrist joint (also active during fist clenching)