Elbow Muscles

  1. Brachialis
    • O: Distal 1/2 of humerus, anterior suface
    • I: Coronoid process and ulnar tuberostiy of ulna
    • A: Elbow Flexion
  2. Biceps Brachii
    • O: long head - supraglenoid tubercle
    • short head - coracoid process
    • I: Radial Tuberosity
    • A: shoulder flexion elbow flexion, forearm supination
    • two jointed muscle. strongest 80-100 weakest at 0
  3. Brachioradialis
    • O: lateral supracondylar ridge or the humerus
    • I: styloid process of the radius
    • A: Elbow Flexion
  4. Triceps Brachii
    • O: long head - infraglenoid tubercle
    • lateral head - inferior to greater tubercle of posterior humerus
    • Medial head - posterior surface of humerus
    • I: olecranon process of ulna
    • A: elbow extension
    • two joint muscle maximum torque at 90 flexion
  5. Anconeus
    • O: lateral epicondyle of humerus
    • I: lateral and inferior to olecranon process of ulna
    • A: not a prime mover in any joint action
  6. Job of the Anconeus
    it pulls on the annular ligament and keeps it from being pinched in the olecranon fossa during elbow extension
  7. Pronator Teres
    • O: Medial epicondyle humerus and coronoid process ulna
    • I:lateral aspect of radius at its midpoint
    • A: pronation, assists elbow flexion
  8. Pronator Quadratus
    • O: distal 1/4 of ulna
    • I: Distal 1/4 of raduis
    • A: forearm pronation
  9. Supinator
    • O: lateral epicondyle of humerus and adjacent ulna
    • I: anterior surface of proximal radius
    • A: forearm supination
Card Set
Elbow Muscles
orgin insertion action