The common pattern of hepatic arterial supply is a common hepatic artery arising from the celiac trunk in the retroperitoneum of the lesser sac. The artery passes a short distance downward and to the right, raising a ridge (hepatopancreatic fold) in the peritoneum above the neck of the pancreas just inside the epiploic foramen. As it enters the hepatoduodenal ligament with the portal vein and common bile duct it gives off the gastroduodenal artery. The continuation is called the proper hepatic artery. The proper hepatic gives off the right gastric before ascending to the liver hilum. At the hilum it divides into right and left hepatic branches in front of the portal vein. The right hepatic artery usually passes behind the common hepatic duct.
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