The “Weakly” Muscle – The Pronator Teres
ORIGIN: Medial epicondyle of the humerus, coronoid process of the ulna, and the common flexor tendon. INSERTION: Lateral radius distal to the insertion of the supinator muscle. ACTION: Weak flexion of the elbow joint, pronation of the forearm. Pronation is a rotation movement where if your right elbow is bent to 90 degrees with elbow … Read more