Confusing as it seems at first, TMJ is essentially a malfunctioning jaw joint. The acronym TMJ stands for two things; your temporomandibular or jaw joint, and a disorder with that very same joint. Your temporomandibular joint is easy to locate. It is just in front of the middle of your ear. To locate it, move your fingers along your cheekbones until they are just in front of your ear. Now, open and close your jaw. The movement that you feel is your jaw joint, the point where your lower jaw attaches to your skull.