Temporomandibular joint (TMJ) syndrome is a pain in the jaw joint that can be caused by a variety of medical problems. The TMJ connects the lower jaw (mandible) to the skull (temporal bone) in front of the ear. Certain facial muscles that control chewing are also attached to the lower jaw.

Reference : Medical Author: Donna S. Bautista, DDS , Medical Editor: Melissa Conrad Stöppler, MD, https://www.emedicinehealth.com/temporomandibular_joint_tmj_syndrome/article_em.htm#what_is_temporomandibular_joint_tmj_syndrome  June 29th, 2019