1. ESS 303 – Biomechanics Upper Extremity – Shoulder Girdle

2. Shoulder Girdle Made of clavicle and scapula 3 joints: sternoclavicular, acromioclavicular, and coracoclavicular Articulations Manibrium/clavicle Scapula to torso – too complex and difficult to analyze for this class

3. The Scapula (Right) Anterior View Posterior View

4. The Clavicle (Right) Superior View Inferior View

5. Shoulder Girdle

6. Shock Absorption “S” shaped clavicle Fibrocartilage disk (Meniscus between manebrium/costal cartilage and clavicle) Double diarthrotic joint Side-impact

7. Movements & Major Muscles Elevation: upper trapezius, levator scapulae, rhomboid major & rhomboid minor Depression: pectoralis minor & lower trapezius Protraction (abduction): pectoralis minor, serratus anterior Retraction (adduction): middle trapezius, levator scapulae, rhomboid major & rhomboid minor Upward rotation: upper trapezius, lower trapezius, serratus anterior Downward rotation: levator scapulae, pectoralis minor, rhomboid major & rhomboid minor