The Elbow and Radioulnar Joints

1. The Elbow and Radioulnar Joints Anatomy and Physiology of Human Movement 420:050

2. The Elbow and Radioulnar Joints • Usually grouped together due to close anatomical relationship • Elbow joint movements may be clearly distinguished from those of the radioulnar joints • Often grouped together due to proximity • Entirely different • Structurally = 2, functionally = 1 • Elbow joint distal attachment: • Ulna • Radioulnar joint distal attachment: • Radius

3. Objectives • Bones, bony landmarks and joints • Muscles • Movements

7. The Elbow and Radioulnar Joints • Elbow Joint • Diarthrodial uniaxial hinge joint • Plane? • Axis? • Movements? • Articulation? • Bony Stops?

8. From Seeley RR, Stephens TD, Tate P: Anatomy & physiology, ed 7, New York, 2006, McGraw-Hill; Shier D, Butler J, Lewis R: hole’s human anatomy & physiology, ed 9, New York, 2002, McGraw-Hill. Radioulnar Joint • Radioulnar Joint • Diarthrodial uniaxial pivot joint • Plane? • Axis? • Movements? • Articulations?

10. Objectives • Bones, bony landmarks and joint • Muscles • Movements

11. Biceps Brachii

12. Brachialis

13. Brachioradialis

14. Triceps Brachii

15. Anconeus

16. Pronator Teres

17. Pronator Quadratus

18. Supinator

19. Objectives • Bones, bony landmarks and joint • Muscles • Movements

20. Movements • Flexion: • Movement of forearm to shoulder by bending the elbow to decrease its angle Extension • Extension: • Movement of forearm away from shoulder by straightening the elbow to increase its angle

21. 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

22. FLEXION • Superior movement of the forearm in the sagittal plane

24. FLEXION

25. FLEXION • Biceps brachii • Brachialis • Brachioradialis • Pronator teres

26. EXTENSION • Inferior movement of the foremarm in the sagittal plane

28. EXTENSION

29. EXTENSION • Triceps • Long head also extends the shoulder • Anconeus

30. PRONATION • Internal rotary movement of the palm to the down position

31. Pronator Quadratus

32. PRONATION Supinated position

33. PRONATION • Brachioradialis • Pronator teres • Pronator quadratus

34. SUPINATION • External rotary movement of the palm to the up position

35. Supinator

36. SUPINATION Supinated position

37. SUPINATION Pronated position

38. SUPINATION • Biceps brachii • Brachioradialis • Supinator