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Marginal cord insertion, also known as eccentric cord insertion, is a term used in obstetrics to describe the location where the umbilical cord attaches to the placenta. In a normal pregnancy, the umbilical cord is centrally attached to the placenta, allowing for even distribution of nutrients and oxygen to the developing fetus. However, in cases of marginal cord insertion, the umbilical cord attaches to the edge or margin of the placenta rather than the center.