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Questions and Answers
What happens on Day 13 of embryonic development?
What happens on Day 13 of embryonic development?
- Endometrial defect at implantation site heals (correct)
- Intercellular spaces are filled with extravasate
- Decidua reaction occurs throughout endometrium
- Exocoelomic cavity is present
What is the buccopharyngeal membrane?
What is the buccopharyngeal membrane?
- A membrane in the cephalic region of the embryo (correct)
- A cavity in the chorionic plate
- A structure in the trophoblast primary villi
- A yolk sac in the bilaminar disc
What is the decidua reaction?
What is the decidua reaction?
- The formation of cellular columns surrounded by syncytium in trophoblast primary villi
- The appearance of the secondary yolk sac and chorionic cavity/plate
- The edematous and glycogen/lipid-loaded state of the endometrium (correct)
- The growth of the bilaminar disc and appearance of the exocoelomic cavity
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Study Notes
- Day 11-12: growth of bilaminar disc is slow, decidua reaction begins
- Day 13: endometrial defect at implantation site heals, trophoblast primary villi appear
- Appearance of secondary yolk sac and chorionic cavity/plate
- Appearance of buccopharyngeal membrane at cephalic region of embryo
- Disc remains very small (0.1 to 0.2 mm)
- Cells of endometrium become polyhedral and loaded with glycogen and lipids
- Intercellular spaces are filled with extravasate, and tissue is edematous
- Decidua reaction occurs throughout endometrium
- Exocoelomic cavity present
- Cellular columns surrounded by syncytium form in trophoblast primary villi
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