True about umbilical cord
Contains 2 umbilcal veins
Contains 1 umbilical aery
Right umbilical vein disappear
Length is 25 - 30 cms
Right umbilical vein regresses and left umbilical vein is left, umbilical cord has two umbilical aeries and the left umbilical vein. An average umbilical cord is 55cm long with a diameter of 1-2 cm and 11helices Ref: Gray's 39e/p-210-220
General anatomy