1. Upper Extremity Musculature

2. Shoulder Complex Scapula Clacivle Sternum Humerus Rib Cage
Sternoclavicular Joint
Acromioclavicular Joint
Glenohumeral Joint
Scapulothoracic Joint / Articulation

4. Shoulder Girdle
Motions available at the shoulder girdle are upward rotation, protraction, downward rotation, retraction, and scapular tilt (when the shoulder enters hyperextension)
Scapulohumeral rhythm: The first 30 degrees of shoulder joint motion is pure GH motion. After the initial 30 degrees, for every 2 degrees of shoulder flexion or abduction, the scapula must upwardly rotate 1 degree. This results in a 2:1 ratio.

5. Scapulothoracic Joint
Articulation of scapula with thorax
Not a true joint
Muscles associated with ST Joint (shoulder girdle)
Trapezius
Rhomboid Major
Rhomboid Minor
Levator Scapulae
Serratus Anterior
Pectoralis Minor

7. Trapezius

8. Upper Trapezius
Origin Occipital Bone, nuchal ligament on cervical spinous processes
Insertion Lateral third of clavicle, acromion process
Action Scapular elevation and upward rotation
Innervation Spinal accessory (cranial nerve XI), C3-C4 sensory component

9. Middle Trapezius Origin Spinous processes of C7 through T3
Insertion Scapular spine
Action Scapular retraction
Innervation Spinal accessory ( cranial nerve XI), C3 and C4 sensory component

10. Lower Trapezius
Origin Spinous processes of middle and lower thoracic vertebrae
Insertion Base of the scapular spine
Action Scapular depression and upward rotation
Innervation Spinal accessory ( cranial nerve XI), C3 and C4 sensory component

11. Rhomboid Major & Minor

12. Rhomboids Origin Spinous processes of C7 through T5
Insertion Medial border of scapula from level of spine to inferior angle
Action Scapular retraction, elevation and downward rotation
Innervation Dorsal scapular nerve (C5)

13. Levator Scapulae

14. Levator Scapulae Origin Transverse processes of C1 - C4 vertebrae
Insertion Vertebral border of scapula between the superior angle and spine
Action Scapular elevation and downward rotation
Innervation Third and fourth cervical nerves and dorsal scapular nerve (C5)

15. Serratus Anterior

16. Serratus Anterior
Origin Superolateral surfaces of upper 8 or 9 ribs at the side of chest
Insertion Vertebral border of scapula, anterior surface
Action Scapular protraction and upward rotation
Innervation Long thoracic nerve (C5, C6, C7)

17. Pectoralis Minor

18. Pectoralis Minor Origin 3rd to 5th ribs, anterior surface
Insertion Coracoid process of the scapula
Action Scapular depression, protraction, downward rotation, and tilt
Innervation Medial pectoral nerve (C8, T1)