Card 9 / 37: Watch this video ( http://openstaxcollege.org/l/TMJ ) to learn about TMJ. Opening of the mouth requires the combination of two motions at the temporomandibular joint, an anterior gliding motion of the articular disc and mandible and the downward hinging of the mandible. What is the initial movement of the mandible during opening and how much mouth opening does this produce?
Answer:
The first motion is rotation (hinging) of the mandible, but this only produces about 20 mm (0.78 in) of mouth opening.
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