人的大眼角和鼻腔之间有一管道系统,叫做泪道,从上到下由泪小点、泪小管、泪总管、泪囊、鼻泪管组成,其功能是引流泪液。也就是说,泪液由泪腺和副泪腺分泌出来后,要通过泪小点(泪道的上口)→泪小管→泪总管→泪囊→鼻泪管的引流最后到达鼻腔。很多人都有过点眼药水后,嘴里会尝到眼药水苦味的经历,这就是眼药水可以随着眼泪经过泪道和鼻腔流至口腔的最好例证。冬季,泪腺受到冷空气刺激以后,反射性地 Human eye and nasal cavity between the pipe system, called the lacrimal duct, from top to bottom by the punctum, lacrimal duct, tear duct, lacrimal sac, nasolacrimal duct composed of its function is to divert tears. In other words, tear secretion by the lacrimal gland and vice lacrimal gland, through the small point of tears (lacrimal passage) → lacrimal duct → tear duct → lacrimal sac → nasolacrimal duct drainage finally reach the nasal cavity. Many people have had eye drops, the taste of eye drops will taste bitter experience, this is the best example of eye drops can flow to the mouth with tears through the lacrimal passages and nose. Winter, lacrimal gland after cold air stimulation, reflexively