The umbilical cord (also called cord light or cord umbilicalis) is the connecting cable from the origin in development or fetus to the placenta. During prenatal development, the umbilical cord comes from the same Zygote as the origin and (in humans) normally contained two arteries (the umbilical arteries) and vein (the umbilical vein), cover jelly of Wharton. Of the umbilical vein of the fetus with supplies oxygenated blood rich in nutrients from the placenta. On the contrary, the umbilical arteries return the blood without oxygen, exhausted nutrients. The cells mother umbilical cord develops from and which contains the remains of the yolk and allantois SAC (and therefore derives from the Zygote as the fetus). It is formed by the fifth week of fetal development, in replacement of the yolk sac as the source of nutrients for the fetus. The cable is not directly connected to the circulatory system of the mother, but it is attached to the placenta, which transfers of materials and of the blood of the mother, without allowing direct mixing.
Lace umbilical in a newborn at term is about 50 centimeters (20 inches) long and about 2 centimeters (0.75 inches) in diameter. This diameter decreases rapidly within the placenta. The umbilical cord is composed of jelly of Wharton, a gelatinous substance, made largely from mucopolysaccharides. It contains a vein, which carries oxygenated blood rich in nutrients for the fetus and two arteries that carry deoxygenated, depletion of nutrients in the blood of distance. Sometimes, only two vessels (one vein and one artery) are present in the umbilical cord. This is sometimes associated with abnormalities in the fetus, but it can also happen without that this entails. Unusual is that one vein for transporting blood oxygenated, and arteries carry deoxygenated blood (the only other examples are the pulmonary arteries, and veins that connects the lungs to the heart). However, this Naming Convention reflects the fact that the umbilical vein carries blood toward the heart of the fetus, while arteries carry umbilical blood. Conservation of umbilical cord stem cells are, from the point of view of the medical scientific community, a biological treasure that we all have in the moment of our birth.