<prompt> Which of the following is anteriorly related to third pa of duodenum:Poal veinHead of pancreasHepatic aerySuperior mesenteric vein  <response>: Superior mesenteric vein and aery cross the anterior to the third pa of the duodenum to enter the mesentery of small intestine. Head of pancreas is in superior relation. Relations : anteriorly: small bowel mesentery root and sup. mesentric aery. :posteriorly: right psoas muscle, right ureter, gonadal vessels, aoa and IVC. 