The Placenta

The Placenta The placenta is a temporary organ that develops in the uterus of a female during pregnancy. At maturity, it is discoid mass that is about 6-8 inches in diameter, weighs 1-2 pounds, and is about 1 ¼ inches thick in the center and tapers contend out towards the edges. (Gray) It separates and connects the foetus and the mother and provides a pathway for oxygen, wholesomes, and dash offs. The placenta is connected to the fetus by the umbilical cord and to the mother by the uterine wall. The placenta serves many critical roles as an anchor, barrier, nutrient transporter, respiratory organ, endocrine, and excretory organ. (Anthonys Textbook) The placenta is technically make up of cardinal beds. The inner layer, the fetal typeface of the placenta, is the amnion. The amnion is the transp argonnt, nomadic change sac that surrounds, holds, and protects the fetus. (Murdoch) The fetal side of the placenta is very liquid and flat. The bosom layer is the chorioallanton ic membrane, which is make up of the chorion and the allantois. The allantois gives rise to bulge of the chorion during placental development, to be described later. (Murdoch) This layer contains the chorionic villi.

The chorionic villi are the looping capillaries of the fetal venules and arterioles, it is here were all the gas, nutrient, and waste win over occurs between the maternal and fetal blood. (Murdoch) The jacket crown layer is a mucous membrane called the decidua, which is where the placenta connects to the endometrium of the uterus. (Gray) This decidual layer does non remain passim the entire pregnancy ; within a few weeks of implantation, the ch! orion of the placenta degrades the layer and leaves it thin and permeable to maternal uterine blood it rear end empty into spaces around the chorionic villi so exchange force out take place. (Gray) The placenta is made up of both maternal and fetal tissues. The maternal side is made of up the highly folded decidua and the fetal side is made up of a network are veins and...If you want to make out a full essay, order it on our website: BestEssayCheap.com

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