1. Upper Extremity Shoulder Girdle

3. Shoulder Girdle • The sternoclavicular joints connect the sternum and clavicle • The acromioclavicular joints connect the acromion process of each scapula with the corresponding clavicle

4. Shoulder Girdle • Since there is no union between the scapula in the back, this is an incomplete girdle

5. Shoulder Girdle • The sternoclavicular joint is a very small joint and it is the sole skeletal connection between the upper extremity and the trunk.

6. Structure of theAcromioclavicularArticulation • Acromioclavicularligament – Strengthens the joint from above • Aponeurosis of the trapezius and the deltoid – Strengthens the joint from behind • Coracoclavicular ligament • Is two ligaments • Bind the clavicle to the coracoid process

8. Structure of theSternoclavicularArticulation • Anterior sternoclavicular ligament – limits anterior movement • Posterior sternoclavicular ligament – limits posterior movement • Interclavicular ligament – limits downward movement • Costoclavicular ligament – limits elevation, protraction, and retraction

10. Movements of the Shoulder Girdle – Scapula • Every movement of the scapula involves motion in both the acromioclavicular and sternoclavicular joints. • Elevation • Depression • Abduction (Protraction) • Adduction (Retraction) • Upward Rotation

11. Muscles of the Shoulder Girdle • Pectoralis minor – Helps with posture (balance out pull of muscles on scapula) • Serratus anterior – Important in reaching and pushing (elevation of the arm) • Subclavius – protect and stabilize the sternoclavicular articulation • Levator scapulae – causes elevation of scapula • Rhomboids (Major & Minor) – causes adduction and elevation of the scapula • Trapezius (4 parts) – causes elevation, retraction, depression, and upward rotation