What are the archenteron and the blastopore? What is the stage of the embryonic development in which these structures are formed?
1From which germ layer do the liver and the pancreas originate? What are other organs and tissues made from that germ layer?
1From which germ layer do blood cells originate? What are other organs and tissues made from that germ layer?
1
What is yolk sac? How is it formed?
What is the difference between amnion and chorion?
What is placenta?
Explain the embryonic development stages after formation of blastula?
Which is the extra embryonic membrane whose function is to store nitrogen wastes of the embryo?
What is the stage of the embryonic development in which these structures are formed?
What are the four initial stages of the embryonic development?
How is the neural tube formed?
What are extra embryonic membranes? Name these layers in vertebrates?
What are the blastopore?
From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer?
What is yolk sac?
What are pericardium?
How is the mesoderm of triploblastic animals formed?
What is umbilical cord? And what are its functions?