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Question of the Day
The placenta in humans is derived from the
The placenta is composed of three layers. The innermost placental layer surrounding the fetus is called the amnion. The allantois is the middle layer of the placenta that derived from the embryo; blood vessels originating from the umbilicus traverse this membrane. The outermost layer of the placenta, the chorion, comes into contact with the endometrium; it is composed of two layers of cells - inner cytotrophoblast and outer syncytiotrophoblast.
embryo only
uterus only
endometrium and embryo
myometrium and embryo
none of the above
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