Temporomandibular disorders are common, especially in young to middle-aged women, and most settle with supportive treatment . Imaging is indicated for the small percentage of cases that do not respond to conservative management and when the diagnosis is no doubt . The temporomandibular joint (TMJ) is a bilateral synovial articulation between the mandible and skull base . It has an intra-articular disc dividing the joint into superior and inferior compartments and the articular surfaces are lined with fibrocartilage . The normal imaging anatomy of the TMJ is described and illustrated . Different movements occur in each joint compartments: a hinge movement in the inferior joint space and translation or gliding in the superior joint space . Internal derangement is the commonest disorder affecting the TMJ and is most commonly due to disc displacement, followed by osteoarthritis and inflammatory arthritides . The imaging findings, primarily on magnetic resonance imaging (MRI) and computed tomography (CT), of internal derangement and less common disorders of the joint, are reviewed and illustrated . Optimal imaging protocols are discussed with detailed reporting guidelines.