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What are the archenteron and the blastopore? What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and of the blastopore?
5After the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be described?
5What is gastrulation? How during gastrulation are the first two germ layers formed? Which are these germ layers?
5Which is the extra embryonic membrane whose function is to store nitrogen wastes of the embryo? Is this function present in placental mammalian embryos?
5What is the chorioallantois membrane present in the embryonic development of reptiles and birds? How does this membrane participate in the energetic metabolism of the embryo?
5How does the embryo turn from gastrula into neurula? How is the neural tube formed? What is the embryonic origin of the nervous system in vertebrates?
5
Explain the morphology of an embryo from ventral to dorsal portion after neural stage?
How yolk sac is formed?
Are the extra embryonic membranes the same in all vertebrates?
After the blastula stage what is the following stage of the embryonic development? How is the passage from blastula to the next stage called?
What is yolk sac? How is it formed?
How during gastrulation are the first two germ layers formed? Which are these germ layers?
In which type of animals does the placenta exist? What is its main function?
Explain gastrulation? What stage follows gastrulation?
What is gastrulation?
What is notochord? How is this structure formed?
What is the function of the yolk sac?
Explain vegetal pole?
What are other organs and tissues made from that germ layer?
Explain coeloms. From which germ layer does it originate?
What is yolk sac?
