Figure 12.

The main portal vein is seen in the longitudinal axis. The posterosuperior pancreaticoduodenal vein is seen merging into the right posterolateral surface of the portal vein. Posterior superior pancreatico duodenal vein is the only vein that joins the posterior surface of the portal vein. The veins that drain the head of pancreas are the anterosuperiorly pancreaticoduodenal vein, the postero-superior pancreaticoduodenal vein, and the inferior pancreaticoduodenal vein. Anterior superior pancreatico duodenal vein descends and joins the gastrocolic trunk, whereas inferior pancreatico duodenal vein crosses the superior mesenteric vein to join the first jejunal vein.