The Shoulder Joint

1. The Shoulder Joint

2. Muscles of the Shoulder Joint Chapter 5

3. Anterior Shoulder Muscles • Coracobrachialis • Pectoralis Major • Subscapularis

5. Coracobrachialis • O: Coracoid process • I: Anteromedial surface of midshaft of humerus • Actions: • Flexion • Adduction of the shoulder • Horizontal Adduction

8. Pectoralis Major • Origin: • Medial two-thirds of clavicle • Sternum • Insertion: intertubercular groove • Actions • Upper fibers (Clavicular) • Internal rotation • Horizontal Adduction • Flexion • Adduction • Lower fibers (Sternal) • Internal Rotation • Horizontal adduction • Extension • Adduction

11. Subscapularis • O: Subscapular fossa • I: Lesser tubercle and crest of humerus • Actions: • Internal Rotation • Adduction • Extension • Stabilization • Anterior Rotator Cuff Muscle.

13. Superior Shoulder Muscles • Deltoid • Supraspinatus

15. Deltoid • Origin • Lateral 1/3 of clavicle (Anterior fibers) • Acromion process (Middle fibers) • Spine of scapula (Posterior fibers) • Insertion – deltoid tuberosity • Actions • Anterior – Abduction, Flexion, Horizontal adduction, & Internal rotation. • Middle – Abduction • Posterior – Abduction, Extension, Horizontal abduction, & External rotation

17. Supraspinatus • O: Supraspinous fossa • I: Greater tubercle • Action: • Abduction • Stabilization • Superior Rotator Cuff Muscle. • Most injuired rotator cuff muscle

19. Inferior Shoulder Muscles • Latissimus Dorsi • Teres Major

20. Latissimus Dorsi • O: Spinous process of lower 6 thorasic and all lumbar and sacral vertebrae; iliac crest • I: Intertubercular groove • Actions: • Adduction • Extension • Internal Rotation • Horizontal Abduction

23. Teres Major • O: Inferior angle of scapula • I: Intertubercular groove • Actions: • Extension • Adduction • Internal rotation • “Lats little helper”

25. Posterior Shoulder Muscles • Infraspinatus • Teres Minor

27. Infraspinatus • O: Infraspinous fossa • I: Greater tubercle • Actions: • External rotation • Horizontal abduction • Extension • Stabilization • Posterior Rotator Cuff Muscle • Second most commonly injured rotator cuff muscle

30. Teres Minor • O: Upper 2/3 of lateral border of scapula • I: Greater tubercle • Actions: • External rotation • Horizontal abduction • Extension • Stabilization • Posterior Rotator Cuff Muscle

32. List the muscles for Horizontal Adduction Name the muscles for Horizontal Abduction Study guide

33. List the muscles that do flexion of the shoulder Practice • List the muscles that do extension of the shoulder

34. List the muscles that do adduction of the shoulder Practice List the muscles that do abduction of the shoulder

35. List the muscles that do internal rotation of the shoulder Practice • List the muscles that do external rotation of the shoulder

36. Name the muscle. Coracobrachialis Name the action Adduction of the shoulder

37. Name the muscle. Pectoralis Major

38. Name the muscle. Subscapularis Name the action Internal rotation of the shoulder

39. Name the muscle. Deltoid Name the action Abduction of shoulder

40. Name the muscle. Infraspinatus Name the action External rotation

41. Name the action Name the muscle. Adduction of scapula Teres Major

42. Name the muscle. Teres Minor Name the action if the humerus move directly to the posterior Extension of the shoulder

43. Name the muscle. Supraspinatus Name the action Abduction of the shoulder

44. Coracobrachialis Pect. Major Subscapularis Deltoid

45. Supraspinatus Teres Major Infraspinatus Teres Minor