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胎儿浸泡于羊水内,羊水为胎儿良好的培养液,因其有抑菌作用,又供胎儿新陈代谢水分与溶质的交换。羊水形成,过去认为系羊膜上皮或平滑绒毛膜所分泌,并因羊水是低渗的,母亲体液是等渗的,故水分可被动渗透。新的概念认为羊膜和绒毛膜是流动镶嵌结构,而且还是多孔组织膜层,水分并不以扩散形式通过,而是以大容积流动形式通过,比单纯扩散方式大100～200倍,可以解释羊水大量转换的机
Fetal soaked in amniotic fluid, amniotic fluid for the fetus a good culture solution, because of its antibacterial effect, but also for fetal metabolism of water and solute exchange. Amniotic fluid formation, the past that the Department of Amniotic epithelial cells or smooth chorion secretions, and because amniotic fluid is hypotonic, the mother’s body fluid is isotonic, so the water can be infiltrated. The new concept that the amniotic membrane and chorionic flow mosaic structure, but also porous tissue membrane, the water does not diffuse through the form, but in large volume flow through the form than the simple proliferation of large 100 ~ 200 times, can explain the amniotic fluid A lot of conversion machine