The shoulder is a complex joint that is composed of the upper humerus (arm bone), scapula (shoulder blade), and clavicle (collar bone). The humerus and scapula are a ball and socket joint. The clavicle meets the scapula at a bony projection from the scapula called the acromion.
The elbow is a hinge joint made up of the lower part of the humerus and the bones of the forearm (radius and ulna).