人的眼睛和鼻腔之间有一条潜行狭长管道相通，这条管道称为泪道，左右各一条泪道起于下眼睑内角小孔，通过泪囊，鼻泪到达鼻腔的下鼻道。当人因悲痛或激动痛时，激动的情绪使交感神经兴奋，泪腺大量泌泪液，泪液部分涌入泪道入鼻腔，部分流眼外，所以“一把鼻涕一把泪”。当泪? Between the human eye and nasal cavity there is a slender tube connected to the pipeline, which is called the lacrimal duct, around a lacrimal duct from the lower corner of the hole, through the lacrimal sac, nasolacrimal reach the nasal lower nasal passages. When people are suffering from pain or agitation, excitement makes the sympathetic nervous excitement, a large number of lacrimal gland lacrimal fluid, part of the influx of tears into the nasal cavity, part of the eye, so “a nose and a tear.” When tears?