Podcast
Questions and Answers
What is the main reason why this week is named as the week of bilaminar germ disc?
What is the main reason why this week is named as the week of bilaminar germ disc?
Which layer of the trophoblast is responsible for mitotic activity during the 8th day of development?
Which layer of the trophoblast is responsible for mitotic activity during the 8th day of development?
What differentiates into the layers of tall columnar cells and small cuboidal cells during the 8th day of development?
What differentiates into the layers of tall columnar cells and small cuboidal cells during the 8th day of development?
What forms the lining of the amniotic cavity during the 8th day of development?
What forms the lining of the amniotic cavity during the 8th day of development?
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Which layer forms a small cavity that enlarges to become the amniotic cavity during the 8th day of development?
Which layer forms a small cavity that enlarges to become the amniotic cavity during the 8th day of development?
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Where are the cells that form the roof of the amniotic cavity located?
Where are the cells that form the roof of the amniotic cavity located?
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What structures form large lacunae known as trophoblastic lacunae during the lacunar stage of development?
What structures form large lacunae known as trophoblastic lacunae during the lacunar stage of development?
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What is responsible for establishing uteroplacental circulation during the 11th to 12th days of development?
What is responsible for establishing uteroplacental circulation during the 11th to 12th days of development?
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Which cells give rise to the exocoelomic membrane (Heuser’s membrane) along the inside of the cytotrophoblast?
Which cells give rise to the exocoelomic membrane (Heuser’s membrane) along the inside of the cytotrophoblast?
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Where do a new group of cells appear between in the 11th to 12th days of development, forming a thin loose connective tissue layer called extraembryonic mesoderm?
Where do a new group of cells appear between in the 11th to 12th days of development, forming a thin loose connective tissue layer called extraembryonic mesoderm?
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What develops in the extraembryonic mesoderm during 11th to 12th days of development?
What develops in the extraembryonic mesoderm during 11th to 12th days of development?
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What is the extraembryonic mesoderm lining the cytotrophoblast called during the 11th to 12th days of development?
What is the extraembryonic mesoderm lining the cytotrophoblast called during the 11th to 12th days of development?
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What happens to the endometrial cells during the 11th to 12th days of development?
What happens to the endometrial cells during the 11th to 12th days of development?
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What is completely embedded in the endometrial stroma during the 11th to 12th days of development?
What is completely embedded in the endometrial stroma during the 11th to 12th days of development?
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What forms a membrane called exocoelomic membrane OR Heuser’s membrane along the inside of the cytotrophoblast?
What forms a membrane called exocoelomic membrane OR Heuser’s membrane along the inside of the cytotrophoblast?
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What are mainly present in the embryonic pole during the lacunar stage of development?
What are mainly present in the embryonic pole during the lacunar stage of development?
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Study Notes
Week of Bilaminar Germ Disc
- Named as the week of bilaminar germ disc because the embryoblast differentiates into two layers: epiblast and hypoblast
Trophoblast
- Mitotic activity is seen in the cytotrophoblast layer during the 8th day of development
Embryoblast
- Epiblast differentiates into tall columnar cells and small cuboidal cells during the 8th day of development
- Hypoblast forms the lining of the amniotic cavity during the 8th day of development
- Epiblast forms a small cavity that enlarges to become the amniotic cavity during the 8th day of development
- Cells that form the roof of the amniotic cavity are located in the epiblast
Lacunar Stage
- Syncytiotrophoblast forms large lacunae known as trophoblastic lacunae during the lacunar stage of development
Uteroplacental Circulation
- Chorionic villi are responsible for establishing uteroplacental circulation during the 11th to 12th days of development
Exocoelomic Membrane
- Cells arising from the hypoblast give rise to the exocoelomic membrane (Heuser’s membrane) along the inside of the cytotrophoblast
Extraembryonic Mesoderm
- A new group of cells appears between the 11th to 12th days of development, forming a thin loose connective tissue layer called extraembryonic mesoderm
- Blood vessels develop in the extraembryonic mesoderm during the 11th to 12th days of development
- Extraembryonic mesoderm lining the cytotrophoblast is called exocoelomic membrane or Heuser’s membrane
- Endometrial cells degenerate during the 11th to 12th days of development
- The conceptus is completely embedded in the endometrial stroma during the 11th to 12th days of development
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Description
Learn about the development of a pregnancy during the first week, including the changes in the endometrial stroma, blastocyst embedding, and trophoblast differentiation. Test your knowledge about the 8th day of pregnancy development with this quiz.
