1. Shoulder region Bones Joints Muscles Vessels & Nerves

2. Classifications of muscles that move the shoulder A. muscles connecting scapula to humerus B. muscles connecting trunk to scapula C. muscles connecting trunk to humerus

3. Biceps & Triceps tendons

4. A. muscles connecting scapula to humerus 1.Supraspinatus 2.Infraspinatus 3.Teres minor 4.Subscapularis 5.Teres major 6.Coracobrachialis 7.Deltoid

5. Short muscles

6. Function: abduction

8. Subscapularis Function: Int. rotation

9. Rotator Cuff

10. Rotator cuff function: only 25% of the humeral head is in contact with the glenoid fossa. The rotator cuff muscles compress and depress the humeral head within the glenoid fossa.

12. Rotator Cuff Disease photo

15. Quiz supraspinatus supraspinatus subscapularis infraspinatus teres minor teres minor

16. Teres major Function: adduction of humerus med rotator Why medial? Origin: – Inf angle of scapula Insertion: – Med lip of groove Actions: – Internal rotation and adduction of arm

17. Coracobrachialis Function: flex & adduct the shoulder joint

18. Deltoid Origin: – Clavicle, scapula Insertion: – Deltoid tuberosity of humerus Actions: – Abduction – Anterior deltoid: internal rotation – Posterior deltoid: external rotation

19. Classifications of muscles that move the shoulder A. muscles connecting scapula to humerus B. muscles connecting trunk to scapula C. muscles connecting trunk to humerus

20. B. muscles connecting trunk to scapula 1.Serratus anterior 2.Levator scapula 3.Rhomboid major 4.Rhomboid minor 5.Trapezius 6.Pectoralis minor

21. Serratus Anterior Origin: – Ribs Insertion: – Medial border of scapula Actions: – Protraction and rotation of scapula

23. Winged scapula

24. Levator scapula Origin: – Cervical vertebrae Insertion: – Scapula Action: – Elevation of the scapula

26. Rhomboid major and minor Origin: – Cervical and Thoracic vertebrae Insertion: – Scapula Actions: – Retraction – Elevation

28. Trapezius Origin: – Occipital bone of skull, cervical and thoracic vertebrae Insertion: – Clavicle and Scapula Actions: – Elevation – retraction

29. Pectoralis Minor Origin: – Ribs Insertion: – Coracoid process of scapula Action: – Depression of scapula

30. Depression of scapula

32. Classifications of muscles that move the shoulder A. muscles connecting scapula to humerus B. muscles connecting trunk to scapula C. muscles connecting trunk to humerus

33. Pectoralis major Latissimus dorsi

34. Pectoralis Major Origin: – Clavicle, sternum, upper ribs Insertion: – Crest of greater tubercle and lat lip Action: – Add, med rotation

35. Latissimus Dorsi Origin: – Vertebrae, sacrum, ilium Insertion: – Medial lip Actions: – Adduction and med rotation of humerus

36. Latissimus Dorsi if humerus is fixed

37. Covering th front and back of the trunk. The pectoralis major and latissimus dorsi both adduct and medially rotate the Humerus. Lower edge of the pectoralis major muscle on rib 7 = upper edge of the latissimus dorsi on vertebra T7.

41. Shoulder Girdle Movements