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The umbilical cord is coated in a substance called Wharton's jelly, which serves to strengthen the cord and protect the blood vessels inside. The maternal end of the umbilical cord is attached to the placenta, which acts as an intermediary between the umbilical cord and the mother's circulatory system. The other end attaches to the fetus in the abdominal area (what will later become a person's navel or belly button).
An umbilical granuloma (gran-you-LOW-ma) is a small, red stalk of scar tissue that stays on a newborn baby's bellybutton after the umbilical cord has fallen off. During pregnancy, the umbilical cord carries nutrients and oxygen from a mother to her unborn baby.