Why does a sagging jaw relax the body?

The most obvious example is yawning, but I have been led to understand that to relax the jaw is to relax the rest of the body. Can anybody enlighten me as to why this is? This is a serious question, so no facetious answers, please!
Answer:

Maybe it is psychosomatic?

Doethine... at Yahoo! Answers Visit the source

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Other answers

Forgive me but I always thought yawning was more to do with oxygen than actual relaxation, as for a relaxed jaw contributing to a relaxed body I always thought that was the other way round as well, I will be very interested in the answers to this question, it is an intriguing one.x.

dot

I don't know, but it's true! My jaw needs to be relaxed before I can go to sleep. The jaw is very thought-responsive, so if your mind is in overdrive, your jaw is probably clenching a lot and therefore not relaxed!

Monkeychops

Don't know why, but in novels they often sat "he clenched his jaw" when he was angry / determined. To relax, I successfully use Silva Mind Control [meditation].

gta

I agree with Bear's answer... intriguer thing it...

Coelho

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