The shoulder is comprised of three bones; the humerus, clavicle and scapula. These three joints are all connected with muscles, tendons and ligaments. The shoulder can be viewed as a shallow ball and socket joint.
The shoulder joint is very complex and unique in that it allows for a wide range of movement, allowing the hand to be placed in almost any point of space. However, the downside to this freedom is that shoulder injuries cause individuals an enormous amount of discomfort and difficulty of movement.