1. Our Amazing Arms & Shoulders

2. Phalanges Metacarpels Carpels

3. Clavicle
(collar bone)
Humerus
Scapula
(shoulder blade)
Ulna
Radius

4. Supination Pronation
4= Radius 5=Ulna

5. Scapula Anatomy 4 Joints of Shoulder Glenoid Cavity & Humerus
Acromioclavicular
Clavicle & Sternum
Scapula & Posterior ribs

6. Rotator Cuff Muscles 1/ Subscapularis – humerus internal rotation
2/ Supraspinatus – humerus abduction
3/ Infraspinatus – humerus external rotation
4/ teres minor – adduction & ex rotation
5/ teres major – internal rotation

7. Deltoid Muscles Posterior Origin – scapula Lateral Origin – acromion
Anterior Origin – clavicle
Insertion – lateral humerus
Posterior Action – extension, horizontal abduction & lateral rotation of humerus
Lateral Action – abduction of humerus to 90°
Anterior Action – flexion, horizontal adduction & medial rotation of humerus

8. Latissimus Dorsi Origin – T7 to iliac crest
Insertion – rotates 180° before inserting on inside of humerus
Action – adduction & extension of humerus
Action when arms are fixed – opens the chest by drawing it forward

9. Rhomboids – Major & Minor
Origin – spinous processes
Insertion – vertical border of scapula
Action – Retraction & downward rotation of scapula

10. Trapezius Origin- extends from lower thoracic to base of skull
Insertion – scapula & clavicle
Upper Action – elevates & rotates scapula
Middle Action – adducts scapula
Lower Action – scapula depression

12. Muscles that act on the scapula
Anterior Muscles

13. Pectoralis Minor Origin - 3rd, 4th & 5th Ribs
Insertion– coracoid process of scapula
Action – protraction, depression & downward rotation of scapula

14. Serratus Anterior Origin – 9 ribs Insertion – medial scapula
Action – protraction & upward rotation of scapula + stabilize scapula on ribcage

15. Muscles that act on the scapula
Posterior Muscles

16. Trapezius Origin- extends from lower thoracic to base of skull
Insertion – scapula & clavicle
Upper Action – elevates & rotates scapula
Middle Action – adducts scapula
Lower Action – scapula depression

17. Rhomboids – Major & Minor
Origin – spinous processes
Insertion – vertical border of scapula
Action – Retraction & downward rotation of scapula

18. Levator Scapule Origin – c1-4 transverse processes
Insertion – medial border of scapula
Action – elevation & downward rotation of scapula

19. Muscles that act on the humerus
Muscles of rotation

20. Rotator Cuff Muscles 1/ Subscapularis – humerus internal rotation
2/ Supraspinatus – humerus abduction
3/ Infraspinatus – humerus external rotation
4/ teres minor – adduction & ex rotation
5/ teres major – adduction & ex rotation

21. Deltoid Muscles Posterior Origin – scapula Lateral Origin – acromion
Anterior Origin – clavicle
Insertion – lateral humerus
Posterior Action – extension, horizontal abduction & lateral rotation of humerus
Lateral Action – abduction of humerus to 90°
Anterior Action – flexion, horizontal adduction & medial rotation of humerus

22. Pectoralis Major Origin – sternum Insertion – inside front humerus
Action – adduction, horizontal adduction & medial rotation of humerus

23. Muscles that act on the humerus
Muscles of abduction & adduction

24. Latissimus Dorsi Origin – T7 to iliac crest
Insertion – rotates 180° before inserting on inside of humerus
Action – adduction & extension of humerus
Action when arms are fixed – opens the chest by drawing it forward

25. Deltoid Muscles Posterior Origin – scapula Lateral Origin – acromion
Anterior Origin – clavicle
Insertion – lateral humerus
Posterior Action – extension, horizontal abduction & lateral rotation of humerus
Lateral Action – abduction of humerus to 90°
Anterior Action – flexion, horizontal adduction & medial rotation of humerus

26. Pectoralis Major Origin – sternum Insertion – inside front humerus
Action – adduction & medial rotation of humerus

27. Biceps Brachii Origin Short head – coracoid process
Origin Long Head – top of glenoid
Insertion – radius
Action – flexes elbow and humerus, supinates forearm

28. Triceps Brachii 3 heads (long, lateral & medial)
Origin – scapula (long head) & humerus (lateral & medial)
Insertion – olecranon process of Ulna
Action – extension of elbow & humerus (long head)

29. Muscles that act on the humerus
Internal Rotation
Anterior deltoid
Pectoralis Major
Subscapularis
Teres Major
Latissimus Dorsi
External Rotation
Infraspinatus
Teres Minor
Posterior Deltoid

30. Muscles that act on the humerus
Adduction
Biceps Brachii
Pectoralis Major
Teres Major
Latissimus Dorsi
Triceps
Abduction
Supraspinatus
Lateral Deltoid
Biceps Brachii

31. Muscles that act on the humerus
Extension
Latissimus dorsi
Teres major
Posterior deltoid
Infrspinatus
Teres Minor
Triceps – long head
Pectoralis Major – sternal head
Flexion
Anterior Deltoid
Pectoralis Major – clavicular head
Biceps Brachii