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Questions and Answers
During the second week of embryonic development, the embryonic disc becomes bilaminar, consisting of which two layers?
Which structures are crucial for the nourishment and protection of the developing embryo during the second week of embryonic development?
What do the amnion and yolk sac contribute to during early stages of embryonic development?
Which components arise from the outer layer of the developing blastocyst during the second week of embryonic development?
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What is the function of syncytiotrophoblast and cytotrophoblast in embryonic development?
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What is the significance of the second week of embryonic development being referred to as the 'week of 2s'?
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What is the function of the amniotic cavity and yolk sac during the second week of embryonic development?
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What occurs early in the second week of embryonic development?
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What contributes to the development and support of the embryo during early stages?
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Study Notes
Embryonic Development: Second Week
- The embryonic disc becomes bilaminar, consisting of two layers: epiblast and hypoblast.
- The trophoblast and chorion are crucial for the nourishment and protection of the developing embryo during the second week.
Extra-Embryonic Membranes
- The amnion and yolk sac contribute to the development and support of the embryo during early stages.
- The amniotic cavity and yolk sac function to nourish and protect the embryo during the second week.
Blastocyst Development
- The outer layer of the developing blastocyst gives rise to the syncytiotrophoblast and cytotrophoblast.
- Syncytiotrophoblast facilitates implantation, while cytotrophoblast contributes to the formation of the chorion.
Significance of the Second Week
- The second week of embryonic development is referred to as the 'week of 2s' due to the formation of two layers, two cavities, and two groups of cells.
Early Events
- Early in the second week of embryonic development, the embryonic disc undergoes gastrulation, and the amniotic cavity and yolk sac develop.
- The trophoblast and chorion contribute to the development and support of the embryo during this stage.
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Description
Explore the key events and structures that characterize the second week of embryonic development, known as the 'week of 2s' due to several occurrences exhibiting a pattern or factor of two.
