<prompt> The poal vein is derived from which of the following?Vitelline veinsUmbilical veinsAnterior cardinal veinsPosterior cardinal veins  <response>: The poal vein is derived from :- Major contribution from Right vitelline vein Minor contribution from left vitelline vein Dorsal anastmosis between left and right vitelline vein NOTE - vitelline of each side are connected to each other by proximal , middle and distal anastmosis 