Experts have dubbed the first section of the duodenum the superior part because of its higher vertebral location. The duodenal bulb touches the stomach, liver, and gallbladder, and is typically where ulcers develop. Behind the duodenum lie several important blood vessels and tracts. The gastroduodenal artery supplies blood to portions of the duodenum and the pylorus. The hepatic portal vein carries blood from various parts of the digestive system to the liver. Finally, the common bile duct sits just behind the bulb and acts as a bridge for bile traveling from the gallbladder to the duodenum.
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