The aim of the study at issue is to deepen the knowledge of Eagle Syndrome and Ernest Syndrome in order to get the practical and scientific directions providing the doctor with a more effective diagnosis, clearing the relationship between them and the TMJD (temporomandibular joint disorders). It might show the clinical procedure concerning the mentioned diseases. Once the aching syntomatology is similar to the signals and symptoms of the temporomandibular disorders, the differencial diagnosis and medical care of the disease get to be complicated. Etiological facts like stress, physical harm on the head, mandibular injuries, car accidents, dental care, surgeries, intubation, tonsillectomy, bruxism or dental tightness are studied and developed in this present study, which also contributes toward a presentation of a simple and important diagnosis technique resource to the evaluation of the cited abnormalities by analyzing panoramic radiographies. An alteration in the stylohyoid chain was testified in 86 from 1063 panoramic radiographies. They were all examined in detail and the patients were given a medical evaluation enquiry. The results made us conclude that factors like stress, mandibular injuries, head and neck traumas could be the causing factors of the alteration in the stylohyoid chain. Furthermore, an unexpected datum was achieved -100% 1of patients under the study suffered from occlusion disorder, which made us infer that a new etiological factor could be proposed.