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The topic chorionic villus is discussed in the following articles:
role in human reproduction
TITLE: pregnancy SECTION: The uterus and the development of the placenta
By the end of the third week, the chorionic villi that form the outer surface of the chorionic sac are covered by a thick layer of cytotrophoblast and have a connective tissue core within which embryonic blood vessels are beginning to develop. The vessels, which arise from the yolk sac, connect with the primitive vascular system in the embryo. As growth progresses the layer of cytotrophoblast...
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