an embryo usually attaches to its mother via an umbilical cord in the uterus.
an embryo usually attaches to its mother via an umbilical cord in the uterus.
where does an embryo usually attach to its mother via an umbilical cord?
uterus
umbilical cord









































in placental mammals, the umbilical cord (also called the navel string, birth cord or funiculus umbilicalis) is a conduit between the developing embryo or fetus and the placenta. during prenatal development, the umbilical cord is physiologically and genetically part of the fetus and (in humans) normally contains two arteries (the umbilical arteries) and one vein (the umbilical vein), buried within wharton's jelly. the umbilical vein supplies the fetus with oxygenated, nutrient-rich blood from the placenta. conversely, the fetal heart pumps low oxygen containing blood, nutrient-depleted blood through the umbilical arteries back to the placenta.









































section::::structure and development.
umbilical cord
japanese hospitals typically place part of the umbilical cord that falls off in a traditional box specifically designed for this purpose. when the mother leaves the hospital, the umbilical cord is given to her. this japanese custom is based upon the belief that the umbilical cord has a direct relationship to the health of the baby. maltreating it, therefore, risks causing harm or disease in the child. in some japanese households, a mother may show a child the umbilical cord on certain events like birthdays to recall the day the child was born. in other households, the umbilical cord is given to a child on the day he or she leaves home or gets married to symbolize separation. also, a preserved umbilical cord is considered to be a cure for the child when he or she is sick. parents would cut a small portion of the cord and feed it to the child. additionally, the japanese believe that the umbilical cord is a symbol of the child's fate. so if one loses his or her umbilical cord, his/her spiritual fate is considered lost as well.
childbirth in japan