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: Insertion: intertubercular groove Actions
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

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 Insertion – deltoid tuberosity Actions
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. Study guide List the muscles for Horizontal Adduction
Name the muscles for Horizontal Abduction

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

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

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