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羊水伴随胎儿,是胎儿生长的外环境,羊水对于胎儿来说是有举足轻重的意义。母血、羊水、胎血三者不断进行交换,胎儿不断吞咽羊水和排出尿液,使胎儿口腔、皮肤、膀胱等脱屑细胞进入羊水里,通过对羊水的检查,能判断胎儿的情况,因而,羊水又是胎儿一面镜子。一、羊水的理化性质与功能羊水是由羊膜分泌的,随着妊娠月分增长,由最初50毫升,逐渐增加到足月时1000～1200毫升,羊水是不断地在交换着,一方面羊膜不断地分泌,同时也不断地吸收羊水到母体循环;另方面,胎儿不断吞咽羊水,同时也不断地排出尿液,并将口腔、泌尿系、皮肤系细胞脱落入羊水。母血与胎血的交换量是很大的,而母血与羊水交换量很小,是相当稳定。羊水为一无色水样液,在妊娠早期是澄清
Amniotic fluid with the fetus is the external environment for fetal growth, amniotic fluid for the fetus is a decisive significance. Maternal blood, amniotic fluid, fetal blood continue to exchange the three, the fetus continue to swallow amniotic fluid and urine, so that fetal mouth, skin, bladder and other desquamation cells into the amniotic fluid, through the amniotic fluid examination, can determine the fetus, and thus Amniotic fluid is a fetus mirror. Amniotic fluid physical and chemical properties and function Amniotic fluid is secreted by the amniotic membrane, with the month of pregnancy increased from the initial 50 ml, gradually increased to full moon 1000 to 1200 ml, amniotic fluid is constantly in exchange, on the one hand continue to amniotic membrane In addition, the fetus continues to swallow amniotic fluid, but also continuously discharged urine, and the oral cavity, urinary system, skin cells shed into the amniotic fluid. The amount of maternal blood and fetal blood exchange is great, while the exchange of maternal blood and amniotic fluid is small, is quite stable. Amniotic fluid is a colorless water sample, is clarified early in pregnancy