After separation from the uterine wall, the fetal membranes have a mean thickness of about 200-300 at term. The presence of the decidua capsularis on the outer surface of the fetal membranes after delivery indicates that separation of the membranes takes place in between maternal tissues rather than along the materno-fetal interface. Due to the absence of vascular structures inside the chorionic as well as amnionic mesoderm, all paraplacen-tal exchanges between fetal membranes and fetus have to pass the amnionic fluid.
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.