In order to perform a correct classification of the TMJ pathologies, they must be divided into two groups: on the one hand, the pathologies of the masticatory muscles, including fibromyalgia, myositis, etc.; these usually present with pain in the occipital, temporal and frontal regions and, in general, are associated with bruxism. Pain is usually observed on movement of the mandible. On the other hand, the pathologies of the joint itself. These include the dysplasias, degenerative diseases, tumors, ankylosis, infectious arthritis, condylar osteolysis, rheumatoid arthritis and fractures (43).