Temporomandibular disorder An extremely unpleasant condition... Temporomandibular joints (TMJ) are the two joints that connect the lower jaw to the skull. The TMJs are some of the most complex joints in the body. Along with several muscles, they allow the lower jaw to move up and down, side to side, forward and backward. However, when the supporting structures of these joints (muscles, ligaments, disc, jawbone, temporal bone) are not synchronized in their movements - problems arise. And one such problem is temporomandibular disorder☝🏻