Duodenal cap

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Disambiguation: Duodenal ampulla redirects here. This page is not to be confused with the Ampulla of Vater (also known as the hepatopancreatic ampulla); the union of the pancreatic duct and the common bile duct.
Duodenal cap
Latin ampulla duodeni; bulbus duodeni
TA A05.6.02.003
FMA FMA:14927
Anatomical terminology

The duodenal cap or duodenal ampulla is the very first part of the duodenum which is slightly dilated.

It is the part which is intraperitoneal and is about 2 cm long. It is mobile and has a mesentery. It is also smooth walled.

It is the most common location of duodenal ulcers as it is where the acidic chyme meets the duodenal mucosa before mixing with the alkaline secretions of the duodenum.[1]

Embryological significance[edit]

The duodenal cap is a remnant of the mesoduodenum,a mesentry which suspends the duodenum from the posterior abdominal wall in foetal life.[2]


  1. ^ Smith, Margaret E. The Digestive System. 
  2. ^ Singh, Inderbir; GP Pal (2012). "13". Human Embryology (9 ed.). Delhi: Macmillan Publishers India. p. 163. ISBN 9789350591222. 

See also[edit]