The acromioclavicular (AC) and sternoclavicular (SC) joints and the suspensory apparatus of the shoulder
The SC joint, the connection between the sternum and clavicle, and the AC joint, i.e. the connection between the clavicle and shoulder blade (acromion), form the static suspensory apparatus of the shoulder and arm on the body.
The AC joint in relation to the acromion and the joint between the humeral head and the socket