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The fetal membranes are the four extraembryonic membranes, associated with the developing embryo, and fetus in humans and other mammals. They are the amnion , chorion , allantois , and yolk sac . [ 1 ]
The third membrane is the allantois, and the fourth is the chorion which surrounds the embryo after about a month and eventually fuses with the amnion. [ 6 ] Amniocentesis is a medical procedure where fluid from the sac is sampled during fetal development , between 15 and 20 weeks of pregnancy, to be used in prenatal diagnosis of chromosomal ...
The amnion (pl.: amnions or amnia) is a membrane that closely covers human and various other embryos when they first form. It fills with amniotic fluid , which causes the amnion to expand and become the amniotic sac that provides a protective environment for the developing embryo.
When fetal kidneys begin to function around week 16, fetal urine also contributes to the fluid. [1] In earlier times, it was believed that the amniotic fluid was composed entirely of excreted fetal urine. The fluid is absorbed through the fetal tissue and skin. [2] After 22 to 25 week of pregnancy, keratinization of an embryo's
A premature rupture of membranes (PROM) is a rupture of the amnion that occurs at full term and prior to the onset of labor. [3] In cases of PROM, options include expectant management without intervention, or interventions such as oxytocin or other methods of labor induction, and both are usually accompanied by close monitoring of maternal and ...
The gestational sac is spherical in shape, and is usually located in the upper part (fundus) of the uterus.By approximately nine weeks of gestational age, due to folding of the trilaminar germ disc, the amniotic sac expands and occupy the majority of the volume of the gestational sac, eventually reducing the extraembryonic coelom (the gestational sac or the chorionic cavity) to a thin layer ...
Chorioamnionitis, also known as amnionitis and intra-amniotic infection (IAI), is inflammation of the fetal membranes (amnion and chorion), usually due to bacterial infection. [1] In 2015, a National Institute of Child Health and Human Development Workshop expert panel recommended use of the term "triple I" to address the heterogeneity of this ...
Circumvallate placenta is a rare condition affecting about 1-2% of pregnancies, in which the amnion and chorion fetal membranes essentially "double back" on the fetal side around the edges of the placenta. [1] After delivery, a circumvallate placenta has a thick ring of membranes on its fetal surface. [2]