Thick keratin layer would ... the yolk sac. Yolk sac is then infiltrated with a system of blood vessels, carrying nutrients from the yolk back to the embryo. Other extra-embryonic folds expand up over ...
The fetal membranes consist of the chorion, amnion, yolk sac, and allantois. The chorion has three layers: cytotrophoblastic ... containment of the amniotic fluid, and secretion of substances ...
Thick keratin layer would ... the yolk sac. Yolk sac is then infiltrated with a system of blood vessels, carrying nutrients from the yolk back to the embryo. Other extra-embryonic folds expand up over ...
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