Fig. 2. Anatomical variations of umbilical ring ligaments and position of Richet's fascia:(1) round ligament (obliterated umbilical vein), (2) median umbilical ligament (closed urachus), (3) medial umbilical ligaments (obliterated umbilical arteries and allantoic duct), (4) umbilical ring, and (5) fascia umbilicalis (Richet's fascia).