Human placenta is derived from:a)Allantois and chorionb)Chorionc)Amniond)AllantoisCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

As chorionic villi after 4 months dissappear from all part except a disc like area where they grow rapidly and participate in the formation of placenta, and chorionic villi are made by chorion?

Answer

Human placenta is composed of both maternal tissue and tissue derived from the embryo. However, it is largely formed by chorion. Chorion is the embryonic-derived portion of the placenta. It contains blood vessels formed by allantois and trophoblasts which are organized into chorionic villi.
Thus, the correct answer is 'Chorion

Answer

The human placenta is derived from the chorion.

Explanation:
- The placenta is an essential organ that develops during pregnancy and plays a crucial role in the exchange of nutrients, gases, and waste products between the mother and the developing fetus.
- It is formed from the fusion of maternal and fetal tissues.
- The placenta is derived from the outermost fetal membrane called the chorion.
- The chorion is one of the extraembryonic membranes that surround the developing embryo/fetus.
- It develops from the trophoblast, which is the outer layer of cells surrounding the blastocyst or early embryo.
- The trophoblast differentiates into two layers: the syncytiotrophoblast and the cytotrophoblast.
- The syncytiotrophoblast forms the outermost layer of the chorion and invades the endometrial lining of the uterus.
- The cytotrophoblast contributes to the formation of the placental villi, which are finger-like projections that increase the surface area for nutrient and gas exchange.
- These villi are further divided into tree-like structures called chorionic villi, which contain fetal blood vessels.
- The chorionic villi extend into the maternal blood-filled spaces called lacunae, forming the placental labyrinth.
- The placental labyrinth is the site of exchange between maternal and fetal blood.
- The chorion also produces human chorionic gonadotropin (hCG), a hormone that is detected in pregnancy tests.
- It provides structural support, protection, and hormonal regulation to sustain the pregnancy.
- The placenta also develops blood vessels that connect to the umbilical cord, which transports oxygen and nutrients from the mother to the fetus and removes waste products.
- In summary, the human placenta is derived from the chorion, which is one of the extraembryonic membranes surrounding the developing fetus. The chorion differentiates into the syncytiotrophoblast, cytotrophoblast, and chorionic villi, forming the placental labyrinth for nutrient and gas exchange.

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