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泪腺知识知多少

来源:[标签:来源] | 发布时间:2011-07-28 21:27:06 | www.chinesejk.com

  泪腺是由细管状腺和导管组成,它是分泌泪液的器官。

  泪腺位于眼眶外上方泪腺窝里,分为上下两个部分:

  上部为眶部,也叫上泪腺,较大,形态很像杏仁,大约12mm×20mm;

  下部为睑部,也叫下泪腺,较小。泪腺有10~12条排泄管,泪液产生后就由这些排泄管排出。

  在正常情况下,泪腺在白天大约分泌0.5~0.6ml的泪液,起湿润眼球的结膜和角膜的作用,而在人睡觉时,则停止分泌泪液。

(编辑:阳阳 )

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