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Questions and Answers
What is the primary focus of this chapter?
How do embryos of the same fertilization age develop?
What is the location of the blastocyst on the eighth day of development?
What is the outer layer of the trophoblast called?
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Where are mitotic figures found?
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What happens to cells in the syncytiotrophoblast?
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What are the two layers that the cells of the inner cell mass differentiate into?
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What is visible in the blastocyst as a small cleft?
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Study Notes
Day 8 of Development
- The blastocyst is partially embedded in the endometrial stroma on the eighth day of development.
- The trophoblast differentiates into two layers:
- Cytotrophoblast: an inner layer of mononucleated cells with mitotic figures.
- Syncytiotrophoblast: an outer multinucleated zone without distinct cell boundaries.
- Cells in the cytotrophoblast divide, migrate into the syncytiotrophoblast, fuse, and lose their individual cell membranes.
Inner Cell Mass or Embryoblast
- The inner cell mass differentiates into two layers:
- Epiblast layer.
- Hypoblast layer.
Developmental Features
- The amniotic cavity appears as a small cleft.
- Embryos of the same fertilization age do not necessarily develop at the same rate, with considerable differences in growth rates even at this early stage.
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Description
Test your knowledge of the major events that occur during the second week of human embryonic development. This quiz covers the growth and differentiation of the blastocyst and embryoblast.
