TMJ, the temporomandibular joint, has a fibrocartilage covered, football shaped ball called the "condyle", fibrous pad known as a "disc", fibrocartilage lined socket (fossa), ligaments, tendons, blood vessels and nerves.  The disc functions as a moving shock absorber and stabilizer between the condyle and fossa.  As the jaw opens, normally the condyle first rotates and then slides forward within the fossa with the disc between the condyle and the fossa.

Diagram shows TMJ with mouth closed

THE MUSCLES OF MASTICATION (jaw muscles) attach to the mandible (lower jaw), maxilla (upper jaw), skull and neck.  The muscles of mastication open, close, protrude and laterally move the jaw, enabling you to talk, chew, and swallow.  The supporting muscles of mastication (neck and shoulder girdle muscles) stabilize the skull on the neck during jaw function.

Diagram shows TMJ with mouth open

If you have problems with your jaw, call Rowen Dentistry in Boca Raton have Dr. Rowen check your TMJ.

Next: TMJ pain