Portal vein is formed -
1.Behind the spleen
2.Behind the tail of pancreas
3.Behind the neck of pancreas
4.Behind the second part of duodenum
exp:
o The portal vein is about 8 cm long.
o It is formed by union of superior mesenteric vein and splenic vein behind the neck of pancreas at the level of L2 vertebrae in front of inferior vena cava (LVC).