The jugular abdomen, where the duodenal wall segment meets the pancreatic duct, opens mostly in the posterior medial wall at the junction of the middle and lower 1/3 of the descending part of the duodenum, and at the lower end of the longitudinal wall of the duodenum. The common bile duct is divided into four segments, namely, the upper duodenal segment, the posterior duodenal segment, the pancreatic segment, and the duodenal wall segment. The duodenal wall segment passes obliquely through the posterior medial wall of the descending middle portion of the duodenum and is slightly enlarged after confluence with the pancreatic duct to form the hepatopancreatic jugular abdomen, also known as the Vater jugular abdomen. There is a sphincter around and near the jug belly and protrudes into the intestinal lumen, causing the duodenal mucosa to bulge and form a large duodenal papilla. The opening of the hepatopancreatic potbelly is mostly in the posterior medial wall at the junction of the middle and lower 1/3 of the descending duodenum, and at the lower end of the longitudinal wall of the duodenum. Based on this landmark, the duodenal greater papilla can be sought during retrograde cholangiopancreatography and jugulotomy. Patients with lesions in the jugular abdomen should go to the hospital in time, and standardize the treatment under the guidance of the doctor to avoid delays.