3 Questions
What appears in the cephalic region during this stage of development?
Buccopharyngeal membrane
What is the size of the disc during this stage of development?
0.1 to 0.2 cm
What is the function of the decidua reaction during this stage of development?
Healing of the endometrial defect
Study Notes
- Day 11-12: Trophoblastic lac and slow growth of bilaminar disc.
- Decidua reaction begins, endometrial cells become loaded with glycogen and lipids.
- Exocoelom is present.
- Day 13: Endometrial defect heals, trophoblast primary villi appear.
- Appearance of secondary yolk sac and chorionic cavity.
- Buccopharangeal membrane appears in cephalic region.
- Disc remains small (0.1 to 0.2 mm).
- Cells of cytotrophoblast proliferate and penetrate syncytiotrophoblast.
- Cellular columns surrounded by syncytium form.
- Appearance of chorionic plate made up of trophoblast and somatopleuric layer of extraembryonic mesoderm.
Test your knowledge on the early stages of embryonic development with this quiz! From the formation of the bilaminar disc to the appearance of the chorionic plate, this quiz will cover key milestones in the first weeks of fetal development. Challenge yourself to remember the specific details of each stage, including the presence of the exocoelom and the formation of cellular columns. Perfect for students of biology and obstetrics, this quiz will help you gain a deeper understanding of the fascinating process of embryogenesis.
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