Definition and Primary Role The placenta is a highly specialized, temporary organ characteristic of viviparous mammals, uniquely developed during gestation to serve as the critical interface between the developing fetus and the maternal uterine wall. Deriving from both fetal (chorion frondosum) and maternal (decidua basalis) tissues, the placenta establishes the necessary metabolic and circulatory connection […]
Definition and Classification The term placental mammal, scientifically classified under the infraclass Eutheria, refers to any mammal that generates a highly specialized organ known as the placenta during gestation. This complex structure serves as the critical interface between the mother and the developing embryo or embryos within the uterus, facilitating the necessary exchange of gases, […]
The Umbilical Cord: A Comprehensive Encyclopedia Entry The Core Definition The umbilical cord represents a fundamental and indispensable structure in mammalian prenatal development, serving as the sole conduit for physiological exchange between the developing fetus and the maternal placenta. This vital connection ensures the continuous supply of essential nutrients and oxygen to the growing organism, […]