|Interior of the stomach. (There is no label for "Duodenal bulb", but the portion of the duodenum labeled at upper left is the duodenal bulb.)|
|Latin||pars superior duodeni, bulbus duodeni|
|Gray's||subject #248 1169|
The duodenal bulb is the portion of the duodenum which is closest to the stomach. It normally has a length of about 5 centimeters. The duodenal bulb begins at the pylorus and ends at the neck of the gallbladder. It is located posterior to the liver and the gallbladder, and superior to the pancreatic head. The gastroduodenal artery, portal vein, and common bile duct lie just behind it. The distal part of the bulb is located retroperitoneally. It abuts the Pyloric sphincter.
The duodenal bulb is the place where duodenal ulcers occur. Duodenal ulcers are more common than gastric ulcers and, unlike gastric ulcers, are caused by increased gastric acid secretion. Duodenal ulcers are commonly located anteriorly, and rarely posteriorly. Anterior ulcers can be complicated by perforation, while the posterior ones bleed. The reason for that is explained by their location. The peritoneal or abdominal cavity is located anterior to the duodenum. Therefore, if the ulcer grows deep enough, it will perforate; whereas if a posterior ulcer grows deep enough, it will perforate the gastroduodenal artery and bleed.
- "Normal Findings in Endoscopy: Bulbus Duodeni". GASTROLAB.
- Diagram - look for figure #2, item #5
- MedEd at Loyola Radio/curriculum/GI/sandy44a.jpg
- Images at gastrolab.net
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