Which embryonic membrane contributes to the formation of the fetal portion of the placenta?
Solution
Correct Answer: Option B
The correct answer is Chorion.
During embryonic development, several extraembryonic membranes form that play crucial roles in supporting and nourishing the embryo. Among these membranes:
- The Chorion is the outermost fetal membrane and plays a pivotal role in placenta formation. It develops from the trophoblast and extraembryonic mesoderm and eventually contributes to the formation of the fetal portion of the placenta. The chorionic villi extend into the maternal endometrium and facilitate nutrient, gas, and waste exchange between the mother and fetus.
- The Amnion surrounds the amniotic cavity, providing a protective fluid-filled environment but does not contribute to the placenta.
- The Yolk sac is involved early in embryonic nutrition and hematopoiesis but does not form any part of the placenta.
- The Decidua basalis is maternal tissue that forms the maternal portion of the placenta, interacting with the fetal chorion.
Therefore, the chorion is the correct answer as it forms the fetal portion of the placenta, which is essential for fetal development.
Reference: Langman’s Medical Embryology, 14th Edition, Chapter 9: Placenta and Fetal Membranes / Page 150-152
During embryonic development, several extraembryonic membranes form that play crucial roles in supporting and nourishing the embryo. Among these membranes:
- The Chorion is the outermost fetal membrane and plays a pivotal role in placenta formation. It develops from the trophoblast and extraembryonic mesoderm and eventually contributes to the formation of the fetal portion of the placenta. The chorionic villi extend into the maternal endometrium and facilitate nutrient, gas, and waste exchange between the mother and fetus.
- The Amnion surrounds the amniotic cavity, providing a protective fluid-filled environment but does not contribute to the placenta.
- The Yolk sac is involved early in embryonic nutrition and hematopoiesis but does not form any part of the placenta.
- The Decidua basalis is maternal tissue that forms the maternal portion of the placenta, interacting with the fetal chorion.
Therefore, the chorion is the correct answer as it forms the fetal portion of the placenta, which is essential for fetal development.
Reference: Langman’s Medical Embryology, 14th Edition, Chapter 9: Placenta and Fetal Membranes / Page 150-152
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