Un-Answered Questions { Embryology }

In which type of animals does the placenta exist? What is its main function?

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Why can the allantois be considered an adaptation to terrestrial life?

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After the blastula stage what is the following stage of the embryonic development? How is the passage from blastula to the next stage called?

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What is the function of the vitellus in the vertebrate egg? How are these eggs classified according to the amount of vitellus within them?

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What are the animal pole and the vegetal pole of the vertebrate egg?

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What are the main substances transferred from the mother to the fetus through the placenta and from the fetus to the mother?

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What are the extra embryonic membranes present in vertebrates?

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Are the extra embryonic membranes the same in all vertebrates?

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Why can the amnion also be considered an adaptation to terrestrial life?

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How is the yolk sac formed? What is the function of the yolk sac?

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Is there exchange of cells between the mother and the fetus through the placenta?

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How is the mesoderm (third germ layer) of triploblastic animals formed?

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What is the cell division during the first stage of the embryonic development called? How is this stage characterized?

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After the morula stage what is the next stage? What is the morphological feature that defines that stage?

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What are histogenesis and organogenesis?

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