The duodenal arterial supply is shown (see pancreatic anatomy). The first, second and third parts of the duodenum are supplied by the anterior and posterior pancreaticoduodenal arcades. The superior origins of the arcades arise from the gastroduodenal branch of the common hepatic, and the inferior feeders from the superior mesenteric artery. Both of these connections are divided in freeing the pancreatic head in the Whipple procedure. The fourth part of the duodenum is supplied by the first mesenteric branches of the superior mesenteric artery.
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