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  "T M J" is the first letters of the three anatomic parts of the head.

 T= Temporal bone (skull), M= Mandible (lower jaw), J= Joint (connects two  bones together) and called  temporo-mandibular-joint. 

 The TMJ is one of the most complex joints in the body. It is composed of a  large group of delicate small muscles, nerves, blood vessels, ligaments,  tendons, cartilage, disc, synovial fluid, retrodiscal tissue: each part works in  harmony with other parts much like a symphony orchestra. 

  All body joints (neck, shoulder, back, hip, knee, wrist, elbow, ankle, finger)  have hinge  movement or circular movement or a combination of both.  However, TMJ has  not only hinge and circular movement, it also has a  gliding movement, in and out of the socket (glenoid fossa): we call it      "Ginglymoarthroidal joint".  

 The function of the TMJ is to hold the lower jaw to the head within a certain  boundary, and guide the jaw movements for chewing, talking, singing,  yawning, breathing, swallowing, keeping the airway open while  sleeping,  and maintaining body posture and balance, etc.

Synonyms

—TMJ- temporomandibular Joint
—TMD- temporomandibular joint Disorder
—Temporomandibular joint Dysfunction
—Temporomandibular joint Syndrome