1. The Shoulder Joint TEST MONDAY

2. Anterior Shoulder Muscles
Coracobrachialis
Pectoralis Major
Subscapularis
Biceps Brachii

4. Biceps Brachii
Origin
Short head: coracoid process of scapula Long head: supraglenoid tubercle of scapula
Insertion Tuberosity of radius
Action Flexion of the elbow and shoulder, Supinates forearm
***the long head is the “5th rotator cuff”

6. Coracobrachialis O: Coracoid process
I: Anteromedial surface of midshaft of humerus
Actions: (WEAK!)
Flexion
Adduction of the shoulder

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

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

14. Superior Shoulder Muscles
Deltoid
Supraspinatus

16. 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 –Flexion
Middle – Abduction
Posterior –Extension

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

21. Inferior Shoulder Muscles
Latissimus Dorsi
Teres Major

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

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

27. Posterior Shoulder Muscles
Infraspinatus
Teres Minor
Triceps Brachii

29. Triceps Brachii Origin
Long head: infraglenoid tubercle of scapula Lateral head: posterior surface of humerus,
Medial head: posterior surface of humerus,
Insertion Olecranon process of ulna
Action Chief extensor of elbow (long head extends the shoulder)

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

34. Teres Minor O: lateral border of scapula I: Greater tubercle Actions:
External rotation
Stabilization
Posterior Rotator Cuff Muscle

36. Muscles of the scapula only

38. Trapezius
Origin occipital bone, nuchal ligament, and spinous processes of C7 - T12 vertebrae
Insertion Lateral third of clavicle, acromion, and spine of scapula
Action
superior fibers elevate,
middle fibers retract,
inferior fibers depress scapula;

40. Levator Scapula Origin C1 - C4 vertebrae Insertion Superior angle
Action Elevates scapula

41. Rhomboid major and minor

42. Rhomboid major and minor
Origin
Minor: spinous processes of C7 and T1 vertebrae Major: spinous processes of T2 - T5 vertebrae
Insertion Medial border of scapula
Action Retract scapula

44. Serratus Anterior Origin the eight upper frontal ribs
Insertion lateral border of scapula
Action protracts scapula

46. Name the muscle.
Coracobrachialis
Name the action
Flexion and Adduction of the shoulder

47. Name the muscle.
Pectoralis Major
Function
Horizontal Adduction
Internal roatation

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

49. Name the muscle.
Deltoid
Name the action
Abduction of shoulder (middle third)
Flexion (anterior deltoid)
Extension (posterior deltoid)

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

51. Name the action
Name the muscle.
Adduction of arm
Teres Major

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

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

54. Coracobrachialis
Pect. Major
Subscapularis
Deltoid

55. Supraspinatus
Teres Major
Infraspinatus
Teres Minor