TMJ stands for the temporomandibular joint, an important joint formed by your skull and your jawbone, using the muscles needed for you to talk and chew food.
The TMJ moves due to the contraction of the masseter, temporalis and pterygoid muscles. Their tone is controlled by the brain-stem housed by the ATLAS. TMJ is highly correlated to the upper cervical spine injury. The muscles of mastication are controlled by the fifth cranial nerve.