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Portal vein – formed posterior to the neck of the pancreas by the union of the splenic and superior mesenteric veins. Splenic artery – courses along the superior border of the pancreas as it travels from the coeliac trunk to the hilum of the spleen.
Posterior to the neck are the superior mesenteric artery and vein and the origin of the hepatic portal vein – formed by the union of the superior mesenteric and splenic veins.
The uncinate process of the pancreas is a hook-shaped anatomical extension projecting from the inferior and medial aspect of the pancreatic head, curving posteriorly and to the left behind the superior mesenteric artery and vein.
Uncinate process dissection indicates the separation of the uncinate process from the superior mesenteric vein (SMV), superior mesenteric artery (SMA) and retroperitoneum.
The uncinate process, unlike the remainder of the organ, passes posteriorly to the superior mesenteric vein (it can pass posteriorly to the superior mesenteric artery, but this is less common).
[Uncinate process - The uncinate is the part of the head that hooks towards the back of the abdomen around two very important blood vessels—the superior mesenteric artery and the superior mesenteric vein.]
Structure The uncinate process is an extension of the inferior aspect of the pancreatic head. It varies in size and prominence between individuals and curves medially to lie posterior to the superior mesenteric vein (SMV) and often the superior mesenteric artery (SMA).