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Assertion: After implantation, finger-li...

Assertion: After implantation, finger-like projections appear on the trophoblast called chorionic villi.
Reason: Chorionic villi are surrounded by the uterine tissue and maternal blood.

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After implanation, finger-like projections appear on the trophoblast called chorionic villi which are surrounded by the uterine tissue and maternal blood. The chronic villi, and uterine tissue become intergitated with each other and jointify form a structural and functional unit between developing embryo (fetus) and maternal body called placenta
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