N: long thoracic nerve- susceptible to damage due to superficial location. C5, c6, c7- wings to heaven (projection of scapula) Objectives: be able to describe the key elements of the joints associated with the shoulder girdle (sternoclavicular and acromioclavicular joints) and the key features of the glenohumeral joints, describe the key elements of the elbow joint. Only boney connection to the axial skeleton. Has articulations with the sternum (sternoclavicular joint), acromion (acromioclavicular joint) Allows scapular rotation- brings ul at optimal distance away from thorax. Transmits impactful forces to axial skeleton- transmits force from wrist to forearm to clavicle to axial skeleton. If force is too great for clavicle to handle, it will fracture. Middle third has the highest incidence of fracture- most thin. Sags the upper limb- lost integrity with clavicle break. Will have anterior movement- pectoralis +/- overcome the shoulder and bring it forward overcome tonic activity.