There are several collateral systems between the primary vascular supply of the foregut and midgut.
The collaterals between the celiac trunk and superior mesenteric artery (SMA) include:
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branch of the common hepatic artery (CHA) and anastomoses with branches of the inferior pancreaticoduodenal artery (IPA)
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dorsal pancreatic artery (DPA)
usually a branch of the splenic artery, which anastomoses with the anterior and posterior pancreaticoduodenal arcades via a right transverse branch of the dorsal pancreatic artery (Kirk's arcade)
arc of Buhler - only present in 1-4% of individuals
arc of Barkow - collateral pathway within the omentum, between the left gastroepiploic artery of the splenic artery and the right gastroepiploic artery arising from the gastroduodenal artery