Shoulder+Anatomy

Bones and Joints
The bones of the shoulder are the humerus and the scapula and the clavicle. The roof of the shoulder is formed by a part of the scapula and acromion. Four joints are forming the shoulder which are glenohumeral joint, acromioclavicular joint (AC), sternoclavicular joint (SC), and scapulothoracic joint. The main joint is glenohumeral joint which is formed where ball of the humerus fits in to a shoulder socket on the scapula. Acromioclavicular joint is form on the clavicle meets the acromion. Sternoclavicular joint helps to connect the arms and shoulder to the main skeleton on the front chest. Scapulothoracic joint also called the false joint. Scapulothoracic joint is important because it surrounds the joint and shoulder blade work together to keep the socket lined up during the shoulder movement. (Photo 1)