Involvement of sex-associated differences in the parasympathetic vasodilatation of the jaw muscles in the etiology of jaw muscle disorders

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The present study was designed to examine whether there are sex-associated differences in the blood flow regulation mediated by autonomic nervous system in the jaw muscles. Our results indicate that the magnitude of parasympathetically mediated blood flow increase in the masseter muscle was much more reduced by intravenous administration of the antimuscarinic agent atropine in female than in male rats, suggesting that cholinergic parasympathetic vasodilator fibers are more involved in the regulation of blood flow to the jaw muscles in females than in males.