Embryology: 2nd Week of Development
10 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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?

    <p>Small cavity</p> Signup and view all the answers

    Where is the blastocyst partially embedded on day 8?

    <p>Endometrial stroma</p> Signup and view all the answers

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

    <p>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.</p> Signup and view all the answers

    Explain the differentiation of the trophoblast on day 8.

    <p>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.</p> Signup and view all the answers

    Discuss the development of the embryoblast on day 8.

    <p>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.</p> Signup and view all the answers

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

    <p>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.</p> Signup and view all the answers

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

    <p>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.</p> 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.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    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.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser