This is true for the sensory and motor homunculus. It is without a doubt the most influential joint in the human body on a motor and sensory functional basis. This is one of the main reasons why the TMJ has such far-reaching effects systemically on the body. It has been my experience that evaluating this type of testing procedure for the past decade has demonstrated its efficacy and consistency. Try it, you'll probably find it very interesting and fun.
References are available upon request.
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