1. The Elbow and Radioulnar Joint Bone and Actions Chapter 6 Bone and Actions Chapter 6

2. Terminology Condyle – large round projection Epicondyle – a projection located above a condyle Fossa- hollow, depression or flattened surface Tubercle - small round projection *Supination – external rotation of the radius *Pronation – internal rotation of the radius

3. Scapula glenoid fossa coracoid process

4. Scapula 2. glenoid fossa 1. coracoid process

5. Humerus

6. medial epicondyle lateral epicondyle trochlea capitulum olecranon fossa head

7. Humerus 2. lateral epicondyle 3. capitulum 4. trochlea 5. medial epicondyle 7. olecranon fossa

8. Radius radial tuberosity head

9. Radius radial tuberosity head

10. Ulna coronoid process trochlear (semilunar) notch olecranon process

11. Ulna 1. olecranon process 2. trochlear (semilunar) notch 3. coronoid process

12. Joints Humeroulnar (elbow) humerus (trochlea) and ulna ( trochlear notch) hinge joint Radioulnar radius (head) and ulna pivot joint Radiohumeral

13. Ligaments Radial collateral Ulnar collateral Annular

14. Ligaments Ulnar collateral ligament

15. Movements Flexion and Extension Elbow or Humeroulnar Joint Sagittal plane Supination and Pronation Radioulnar Transverse plane

16. Movements Flexion movement of forearm to shoulder by bending the elbow to decrease its angle Extension movement of forearm away from shoulder by straightening the elbow to increase its angle

17. Actions What is the action when an anterior muscle contracts? What is the action when a posterior muscle contracts?

18. Actions ELBOW EXTENSION ELBOW FLEXION

19. Movements Pronation internal rotary movement of radius on ulna that results in hand moving from palm- up to palm-down position Supination external rotary movement of radius on ulna that results in hand moving from palm-down to palm-up position

20. Actions Pronation & Supination

21. Pronation Radius moves medially Ends up crossing the ulna

22. Supination Radius moves laterally Ends up parallel to the ulna

23. Neutral Position

24. Actions

25. Synergy between joints Tightening a screw: supination and flexion Loosening a screw: pronation and extension