Embryonic Development

1. Development on day 11 and 12 involves slow growth of the bilaminar disc.
2. Decidua reaction begins, causing endometrial cells to become glycogen and lipid-loaded.
3. Trophoblast primary villi appear on day 13.
4. The endometrial defect at the site of implantation heals completely.
5. Secondary yolk sac appears within the exocoelomic cavity.
6. Chorionic cavity and chorionic plate appear.
7. Buccopharyngeal membrane appears as a thickening of the hypoblastic disc.
8. The bilaminar disc remains small (0.1 to 0.2 mm).
9. Cells of the cytotrophoblast proliferate locally and penetrate into the syncytiotrophoblast.
10. Intercellular spaces in the endometrium become filled with extravasate and the tissue is edematous.

Take this quiz to test your knowledge of the key developmental events that occur during the first few weeks of pregnancy. From the appearance of the bilaminar disc to the formation of the chorionic cavity and chorionic plate, this quiz covers the important milestones that take place during early embryonic development. Use your knowledge of specific keywords like trophoblast primary villi and buccopharyngeal membrane to identify the correct answers and ace this quiz!