During all the movements of the jaw, only the lower jaw moves. This movement is possible at the Temporo- mandibular joint (TMJ).
Where is the Temporo-mandibular joint (TMJ) located?
The temporo-mandibular joint (TMJ) is located on both sides of the face, just in front of the ears, and connects our lower jaw (the mandible) to the skull bone (temporal bone). TM Joint- slides as well as rotate and assists in movements like chewing and speaking.
How does Temporo-mandibular Joint (TMJ) function?
TM Joint- slides as well as rotate and assists in movements like chewing and speaking.
Since TMJ is connected to the mandible, the right and left joints must function together and therefore are not independent of each other. It has a gliding function (side to side) and a hinging (front and back) function.
How much is the normal mouth opening?
Normal full mouth opening is around 4-5 cm as measured from the edge of lower front teeth to the edge of upper front teeth. The movements occur mainly by the four muscles: the masseter, medial pterygoid, lateral pterygoid, and temporalis. These four muscles move the mandible in different directions.
What is the mechanism of mouth opening? What is the role of TMJ?
The movements occur mainly by the four muscles: the masseter, medial pterygoid, lateral pterygoid, and temporalis. These four muscles move the lower jaw in different directions.
The TM joint space between the two bones is separated by an articular disc, which divides the joint into two distinct compartments.
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