Placenta Okonchataya

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The placental window is the name given to the area of ​​fetoplacental blood circulation in the placenta at the site of the porous formation of chorionic villi. It is also called the “door”. The umbilical cord enters the placenta and divides it into two parts: one part is the uteroplacental part, the second is the feto-placental part. Due to the penetration of fetal and maternal blood from the uterine region into the placental region, metabolism occurs. During the process of gestation, the functions of the placenta change somewhat: if until the third month of pregnancy the placenta completely covers the fetal membrane, then starting from the fourth month the chorion forms tissue around it that penetrates the structure of the placenta. The function of the placenta in the early stages is as barriers to the passage of various antigens trying to penetrate into the ho