Embryology Question:
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What is gastrulation? How during gastrulation are the first two germ layers formed? Which are these germ layers?

Answer:

Gastrulation is the process through which a portion of the blastula wall undergoes invagination inside the blastocele forming a tube called archenteron (primitive intestine). The cells of the inner side of the tube form the endoderm (germ layer) and the cells of the outer side form the ectoderm (another germ layer). It is the beginning of the tissue differentiation in the embryonic development.

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