The neck of pancreas is related on its posterior surface to
Neck of pancreas is located between the head and the body of the pancreas. It overlies the superior mesenteric vessels which form a groove in its posterior aspect. Ref - BDC 6e vol2 pg 298-300
Gastroduodenal aery
Superior mesenteric vein
Inferior vena cava
Bile duct
Abdomen and pelvis