Chorion
Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.
The chorion is a membrane which develops between the mother and the fetus in pregnancy; it grows around the fetus and around other membranes which protect the developing fetus. The chorion provides for nutrient, oxygen, and waste transfer between the mother and fetus via the chorionic villi, which grow out of the chorion and into the endometrium.
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