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Embryology: 2nd Week of Development

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@UnfetteredTriumph

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Questions and Answers

What differentiates into two layers over the embryoblast on day 8?

Syncytiotrophoblast

Trophoblast (correct)

Endometrial stroma

Cytotrophoblast

What type of cells form the outer layer of the trophoblast on day 8?

Syncytiotrophoblast (correct)

Cytotrophoblast

Multinucleated zone without clear cell boundaries

Mononucleated cells

What is formed by the cells of the inner cell mass or embryoblast on day 8?

Endometrial stroma

Bilaminar embryonic disc

Blastocyst cavity

Hypoblast and epiblast layer (correct)

What appears within the epiblast on day 8?

Small cavity Signup and view all the answers

Where is the blastocyst partially embedded on day 8?

Endometrial stroma Signup and view all the answers

Describe the structure of the blastocyst on day 8 of development.

The blastocyst on day 8 of development consists of a trophoblast partially embedded in the endometrial stroma, with the inner layer differentiating into cytotrophoblast and syncytiotrophoblast, and the embryoblast forming a bilaminar embryonic disc with epiblast and hypoblast layers. Signup and view all the answers

Explain the differentiation of the trophoblast on day 8.

On day 8, the trophoblast differentiates into two layers: the inner layer forms cytotrophoblast with mononucleated cells, and the outer layer forms syncytiotrophoblast with multinucleated zone without clear cell boundaries. Signup and view all the answers

Discuss the development of the embryoblast on day 8.

On day 8, the cells of the inner cell mass or embryoblast differentiate into two layers: hypoblast consisting of small high cuboidal cells near the blastocyst cavity, and epiblast forming a flat disc with columnar cells near the amniotic cavity. Signup and view all the answers

What is the significance of the small cavity appearing within the epiblast on day 8?

The small cavity appearing within the epiblast on day 8 contributes to the formation of the bilaminar embryonic disc, consisting of epiblast and hypoblast layers, which is essential for further embryonic development. Signup and view all the answers

Explain the process of cell migration within the trophoblast on day 8.

On day 8, the cells in the cytotrophoblast divide and migrate into the syncytiotrophoblast, forming multinucleated zone without clear cell boundaries within the outer layer of the trophoblast. Signup and view all the answers

Study Notes

The second week of development (Bilaminar germ disc) is the focus of this lecture.
The blastocyst, a fluid-filled structure, is partially embedded in the endometrial stroma on Day 8.
The trophoblast layer of the blastocyst differentiates into two layers: an outer layer (syncytio trophoblast) and an inner layer (cyto trophoblast). The outer layer has multinucleated cells, while the inner layer has mononucleated cells.
Cells of the inner cell mass or embryoblast differentiate into two layers: the epiblast and hypoblast. The epiblast forms the embryyonic disc and has small, high, cuboidal, and columnar cells, while the hypoblast forms the extraembryonic membranes.
A small cavity appears within the epiblast on Day 8, leading to the formation of the blastocyst cavity. The two layers then form a flat disc called the bilaminar embryonic disc.

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Description

Test your knowledge of the 2nd week of embryonic development, focusing on the bilaminar germ disc, blastocyst stages, and endometrial stroma embedding. This quiz covers the key events of day 8 and day 9 of development.