Duodenal cap

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Duodenal cap
Latin ampulla duodeni; bulbus duodeni

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]