The shoulder is a very complex joint in the body that allows for a wide range of motion. It is this large range of motion that can lead to complications and injuries in this region of the body. The shoulder joint consists of multiple layers: the deepest is the joint and bone, the next layer is made up of the ligaments, and the outermost layer is comprised of the muscles and tendons. Understanding how the shoulder is made up can allow you to better understand the way this complex joint operates and how to prevent injuries from occurring.