The skin temperature ( T _m) of the orofacial area influences orofacial functions and is related to the blood flow (BF). Marked increases in BF mediated by parasympathetic vasodilation may be important for orofacial T _m regulation. Therefore, we examined the relationship between parasympathetic reflex vasodilation and orofacial T _m in anesthetized rats. Electrical stimulation of the central cut end of the lingual nerve (LN) elicited significant increases in BF and T _m in the lower lip. These increases were significantly reduced by hexamethonium, but not atropine. VIP agonist increased both BF and T _m in the lower lip. The activation of the superior cervical sympathetic trunk (CST) decreased BF and T _m in the lower lip; however, these decreases were significantly inhibited by LN stimulation. Our results suggest that parasympathetic vasodilation plays an important role in the maintaining the hemodynamics and T _m in the orofacial area, and that VIP may be involved in this response.

中文翻译：

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副交感血管舒张对口面部三叉神经传入温度调节的影响

口腔区域的皮肤温度（ T _m）影响口腔功能，并与血流量（BF）有关。由副交感神经血管舒张介导的BF的明显增加可能对口面部 T _m调节很重要 。因此，我们研究了麻醉大鼠副交感神经反射性血管舒张与口面部 T _m的关系 。电刺激舌神经（LN）的中央切口末端导致下唇的BF和 T _m显着增加 。六甲铵可显着降低这些增加，但阿托品不会。VIP激动剂同时增加了BF和 T _m在下唇。上颈交感神经干（CST）的激活降低了下唇的BF和 T _m。但是，这些减少被LN刺激显着抑制。我们的结果表明，副交感神经血管舒张在维持口面区域的血流动力学和 T _m方面起着重要作用 ，并且VIP可能参与了这种反应。