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对于胎几正常发育必须有明显的水代谢即胎儿、羊水与母体之间的水代谢,而胎尿分泌到羊水内具有很大的作用。这种代谢机制和生理作用虽然已研究得很多,但尚未彻底查明。水通过位于母体和胎儿血液交换途径上的全部半透膜进行交换。半透膜有:胎盘薄膜、绒毛膜、羊膜,覆盖在胎儿内测表面和脐带上的膜以及胎儿皮肤。水交换主要途径是经过母体胎盘至胎儿,胎儿通过排尿至羊水,羊水通过绒毛羊膜至母体。此外,在胎儿与羊水之间还进行被胎儿吸收的液体
Several normal fetal development must have significant water metabolism that the fetus, amniotic fluid and water metabolism between the mother, while the secretion of fetal urine to amniotic fluid has a significant role. Although this metabolic mechanism and physiological role has been studied a lot, but not yet completely identified. Water is exchanged through the entire semi-permeable membrane located on the maternal and fetal blood exchange pathways. Semipermeable membranes are: placenta, chorion, amniotic membrane, covering the fetal test surface and umbilical cord on the membrane and fetal skin. The main water exchange is through the mother’s placenta to the fetus, the fetus through the urine to the amniotic fluid, amniotic fluid through the chorionic villus to maternal. In addition, the fetus and amniotic fluid between the fluid is also absorbed by the fetus