The temporomandibular joint (TMJ) is your jaw joint formed by the mandible, or lower jaw, and the temporal bone of the skull. It is an unique joint because it is a sliding joint and is capable of two types of movement. These movements are rotational, as with other ball and socket joints, and translational - in effect, a forward sliding motion. What also makes it unique is that it is the only bilateral joint in the body. Located between the two bones is a disc, called the meni