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Questions and Answers
What is the name of the structure that forms during the second week of development?
What is the name of the structure that forms during the second week of development?
- Morula
- Bilaminar germ disc (correct)
- Trophoblastic lacunae
- Blastocyst
What differentiates into a hypoblast layer and an epiblast layer, forming the bilaminar germ disc?
What differentiates into a hypoblast layer and an epiblast layer, forming the bilaminar germ disc?
- Inner cell mass (correct)
- Multinucleated zone
- Trophoblast
- Mononucleated cells
What appears within the epiblast layer during the development of the bilaminar germ disc?
What appears within the epiblast layer during the development of the bilaminar germ disc?
- Trophoblastic lacunae
- Morula
- Blastocyst
- Amniotic cavity (correct)
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Study Notes
- At the end of the first week of development, the zygote has passed through the morula and blastocyst stages and has begun implantation.
- The second week is characterized by the development of the bilaminar germ disc.
- Day 8 sees the blastocyst partially embedded in the endometrial area over the embryoblast.
- The trophoblast differentiates into two layers: an inner layer of mononucleated cells and an outer multinucleated zone.
- The inner cell mass differentiates into a hypoblast layer and an epiblast layer, forming the bilaminar germ disc.
- An amniotic cavity appears within the epiblast layer.
- On day 9 and 10, the blastocyst becomes more deeply embedded in the endometrium.
- Trophoblastic lacunae form during this time.
- The bilaminar germ disc continues to develop day-by-day.
- This period is a crucial stage in embryonic development.
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