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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
What are the cells produced in the first stage of the embryonic development called?
Explain notochord?
What is the function of the vitellus in the vertebrate egg?
Explain pericardium?
What are the animal pole and the vegetal pole of the vertebrate egg?
What is the significance of placenta?
How during gastrulation are the first two germ layers formed? Which are these germ layers?
What are pericardium?
How is the neural tube formed? What is the embryonic origin of the nervous system in vertebrates?
What are other organs and tissues made from that germ layer?
From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer?
Explain archenteron?
What are the functions of umbilical cord?
Explain gastrulation?
In which type of animals does the placenta exist?
