Fetus in utero (Latin)

While in the uterus, the fetus is surrounded by a thin double layered membrane called the saccus amnii. The inner layer (closer to the fetus) is also known as the amnion, while the outer layer (closer to the uterus) is also known as the chorion. The saccus amnii is filled with liqour amnii that surrounds and bathes the fetus during development. The fetus is connected to the placenta via the funiculus umbilicalis. The funiculus umbilicalis has two aa. umbilicales that carry the deoxygenated blood from the fetus. In contrast, a single v. umbilicalis carries oxygenated blood, rich in nutrients from the mother to the fetus.