胎儿生存在密闭的胎囊里。妊娠十二周以后,胎囊充盈在子宫腔里,胎囊的内层——羊膜腔里充满羊水。为什么人类妊娠,却要用“羊水”、“羊膜”这些名词呢? 这是医学上的一个小掌故。当初人们研究胚胎学时,先解剖了怀羔的母羊,发现羊的胎囊里有一层膜包着一兜水,因此沿袭下来,在产科学上也通称羊膜、羊水。我国民间则称为胎胞、浆胞和浆胞水。羊水的主要来源是由孕妇血清渗透进入羊膜腔的。妊娠十四周以后,胎儿可以排尿,胎儿的尿也是羊水的组成部分,用“B”型超声仪探测,可以清楚地 Fetal survival in a closed fetal sac. Twelve weeks after pregnancy, fetal capsule filled in the uterine cavity, the inner layer of fetal sac - amniotic fluid filled with amniotic fluid. Why human pregnancy, but to use “amniotic fluid ”, “amniotic membrane ” these terms? This is a medical treatment of a small palm. When people began to study embryology, they first dissected the ewes with lambs and found that there was a layer of membrane in the goat’s sac that covered the sheepskin. Therefore, it was also followed by obstetrics and called amniotic fluid and amniotic fluid. China’s folk are called fetal cells, plasma cells and plasma cells. The main source of amniotic fluid is infiltrated into the amniotic cavity by the serum of pregnant women. Fourteen weeks after pregnancy, the fetus can urinate, fetal urine is also an integral part of amniotic fluid, with “B ” type ultrasound probe, you can clearly