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Questions and Answers
Which of the following is NOT a function of the extraembryonic membranes?
What is the primary function of the yolk sac in human embryonic development?
Which of the following statements about the bilaminar embryonic disc is correct?
Which of the following extraembryonic membranes is formed from and continuous with the hypoblast layer?
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What is the function of the cloacal membrane during embryonic development?
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Which of the following statements about the amnion is correct?
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Which of the following structures is responsible for the formation of the notochord during embryonic development?
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What is the primary function of the oropharyngeal membrane during embryonic development?
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Which of the following statements about neurulation is correct?
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Which of the following structures is NOT involved in the formation or development of the notochord?
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Study Notes
Week 2 of Development
- The second week of development is characterized by the formation of a two-layered germinal disc consisting of epiblast and hypoblast.
- Two membranes, the yolk sac and amnion, develop on either side of the bilaminar germinal disc.
- The placenta develops from two components that merge: the chorion and the functional layer of the endometrium of the uterus.
Development of Trophoblast
- The trophoblast develops into two layers around 8 days after fertilization.
- The amnion is a thin membrane that encloses the entire embryo in a fluid-filled sac called the amniotic cavity, protecting the embryo from desiccation.
- The amniotic membrane secretes amniotic fluid that bathes the embryo.
Development of Bilaminar Embryonic Disc
- The chorion is the outermost extraembryonic membrane formed from cytotrophoblast cells and syncytiotrophoblast.
- The chorion blends with the functional layer of the endometrium to form the placenta, the site of exchange between the embryo and the mother.
Week 3 of Development
- The third embryonic week marks the beginning of a 6-week period of rapid development and differentiation.
- During this week, the three primary germ layers are established, laying the groundwork for organ development in weeks 4-8.
Processes of Week 3
- Gastrulation
- Notochord formation
- Neural tube development
- Somite formation
- Intraembryonic coelom
- Primitive cardiovascular system
- Blood and blood vessel formation
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Description
Test your knowledge on the developmental anatomy of human beings, focusing on weeks 2 and 3 of development. Explore topics such as embryonic periods, germinal discs, embryoblast, and trophoblast layers.
