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為什麼牙痛時無法定位？

Posted By vickong pun     July 5, 2021    

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為什麼牙痛時無法定位？

　　為什麼牙痛時無法定位？歸納為：

①牙髓內神經元內僅有疼痛感受器，而無本體感受器；

②左右前牙牙髓神經可以相互跨越到達對側三叉神經節內的神經元；

③上下後牙髓神經在三叉神經節內有明顯交叉，並可達到同側頸上、耳後神經節的神經元內；

④三叉神經內的一個神經元可以控制2顆牙的感覺，也可同時支配上下頜骨、牙周、頭、面部較為廣泛的組織的感覺。

這種複雜牙髓神經分佈決定了牙痛時無法定位。

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