Ligamentum teres is a remnant of the umbilical vein. The vessels that are occluded soon after bih are in due to course replaced by fibrous tissue and forms the following ligaments: Fetal structure Adult structure Foramen ovale Fossa ovalis Umbilical vein Ligamentum teres Ductus venosus Ligamentum venosum Umbilical aeries Medial umbilical ligaments Ductus aeriosus Ligamentum aeriosum Note: the median umbilical ligament or Xander&;s ligament represents the remnant of the embryonic urachus The lateral umbilical ligaments are folds of peritoneum over the inferior epigastric aeries Ref: Nelson textbook of pediatrics 21st edition Pgno: 975