Posterior relation of poal vein
The poal vein usually measures approximately 8 cm in adults. It originates behind the neck of the pancreas and is classically formed by the confluence of the superior mesenteric and splenic veins. ref - BDC 6e vol2 pg282 , researchgate.net
1st pa of duodenum
Hepatic aery
Bile duct
IVC
Abdomen and pelvis