<prompt> False about poal veinFirst 5 cm doesnt give any branchesIt arises behind pancreatic headIt has constant lengthIt is a pa of the hepatic poal system  <response>: The hepatic poal vein is a vessel that moves blood from the spleen and gastrointestinal tract to the liver. It is approximately three to four inches in length and is usually formed by the merging of the superior mesenteric and splenic veins behind the upper edge of the head of the pancreas. ref - BDC 6e vol2 pg282-3 