Pronator Teres works the hardest when the elbow is flexing the hand simultaneously pronating.


  • Medial supracondylar ridge of the humerus
  • Medial side of the coronoid process of the ulna


  • Middle 1/3 of the outer surface of the radius


  • Pronation
  • Elbow flexion


  • Median nerve

Daily uses

  • Turning a screwdriver

Elbow Joint Muscles:

Related Articles

Biceps Brachii

The Biceps brachii crosses both the elbow and shoulder joints. It is a weak flexor of the shoulder joint but is a strong flexor the elbow joint, especially when the forearm is supinated (palm facing...

Triceps Brachii

The Triceps Brachii also assists Latissimus Dorsi in extending the shoulder joint. It contracts strongly during the up phase of a push-up, to straighten the arm.


The Brachioradialis muscle acts to supinate the forearm from a pronated position, when it flexes the elbow. When starting in a supinated position, it acts to pronate the hand as it flexes the elbow.


The supinator muscle assists Biceps brachii in supinating the hand, that is turning it over so that the palm faces up. To isolate the supinator muscle, supinate the hand whilst extending the elbow...

More Human Muscles: