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In cases of placenta abnormallity, a complication during pregnancy, the placenta abnormally attaches to the myometrium or muscular lining of the uterus. Among the following statements, which accurately describes the normal formation of the placenta during pregnancies?
The umbilical cord invades the embryo’s outermost layer, assisting in its formation.
The umbilical cord attaches the placenta to the embryo, but it does not contribute to its formation.
The blastocyst interdigitates with the Fallopian tube lining during placenta formation.
The trophoblast extends villi into the endometrial wall as part of placenta formation.
Answers (1)
During normal placenta formation, the trophoblast, an outer layer of cells in the developing embryo, extends finger-like projections called villi into the endometrial wall of the uterus. These villi establish a connection with the maternal blood vessels in the uterus, allowing for the exchange of nutrients, oxygen and waste products between the mother and the developing fetus. This process is essential for the proper development and functioning of the placenta during pregnancy.Hence, the correct answer is option 4.
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