Umbilical cord has?
A i.e. 2 aery and 1 veinInitially in embryo there are 4 vessels - 2 umbilical aeries & 2 umbilical vein. The aeries carry venous blood from fetus to placenta & veins carry oxygenated blood from placenta to embryo.At 4 months right umbilican vein disappears i.e. left umbilical vein is leftQ. So after 4 months umbilical cord contains 2 aeries & left umbilical veinQA Single umbilical aery is present in 1% cases; more commonly in twins & babies born to diabetic mothersQ. It is frequently associated with congenital malformation of fetus (renal abnormalities)QAfter bih left umbilical vein forms ligamentum teres hepatisQ & ductus venosus form ligamentum venosum.
2 aery and 1 vein
1 aery and 2 vein
2 aery and 2 vein
Only one aery