<P> The collarbone is a large doubly curved long bone that connects the arm to the trunk of the body . Located directly above the first rib it acts as a strut to keep the scapula in place so that the arm can hang freely . Medially , it articulates with the manubrium of the sternum ( breastbone ) at the sternoclavicular joint . At its lateral end it articulates with the acromion , a process of the scapula ( shoulder blade ) at the acromioclavicular joint . It has a rounded medial end and a flattened lateral end . </P>
at what level is the clavicle with reference to the ribs
directly above the first rib