All the following features are true about umbilical cord except

At bih umbilical cord is approximately 1 to 2cm in diameter and 50 to 60 cm long.Umbilical vessels are surrounded by Whaon&;s jelly. This tissue, which is rich in proteoglycans, functions as a protective layer for the blood vesselsThe cord at term normally has two aeries and one vein. The right umbilical vein usually disappears early during fetal development, leaving only the original left vein.The intraabdominal poion of the duct of the umbilical vesicle, which extends from umbilicus to intestine, usually atrophies and disappears, but occasionally it remains patent, forming the Meckel diveiculum.The most common vascular anomaly is the absence of one umbilical aery, which may be associated with fetal anomaliesReference:Williams obstetrics;24th edition;ImplantationandPlacentaldevelopment; Page no:100