Allantois

does anyone know exactly how the four membranes amnion yolk sac chorion, and allantois work to protect the embryo and egg?

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Extraembryonic Membranes The embryos of reptiles, birds, and mammals produce 4 extraembryonic membranes: amnion yolk sac chorion, and allantois With these four membranes, the developing embryo is able to carry on essential metabolism while sealed within the egg . Surrounded by amniotic fluid, ...

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... is/are paired in your embryo model?,,,,(we make a model of an embryo in an upcoming lab..so I guess this refers to "real life") 1)Allantois 2)Pharyngeal pouch 3)Hindbrain 4)Aortic arch 5)Common cardinal vein Thank you very much biology_06er

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