wkes.eu The extensor carpi ulnaris (ECU) muscle plays a key role not only in the active movements of wrist extension and ulnar deviation ... when the wrist is moving between pronation and supination, ...

"The elbow is a joint formed by three bones—humerus, ulna and radius—and its flexion–extension and pronation–supination mechanisms play a key role in different types of arboreal locomotion ...