Sphincter of Oddi
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The sphincter of Oddi (also known as the sphincter of ampulla or choledochal sphincter) is a complex of four smooth muscle sphincters within the duodenal wall. It surrounds, and helps fix to the duodenum, the duct of Wirsung, common bile duct and the ampulla of Vater 1,2.
When relaxed it allows the passage of bile into the intestine and when contracted prevents the reflux of duodenal contents into the ducts and helps facilitates the filling of the gallbladder 1.
History and etymology
It is named after Ruggero Oddi (1864-1913), an Italian physiologist. The sphincter of Oddi was initially described by Francis Glisson (1597-1677) 3.
- 1. Lack EE. Pathology of the pancreas, gallbladder, extrahepatic biliary tract, and ampullary region. Oxford University Press, USA. ISBN:0195133927. Read it at Google Books - Find it at Amazon
- 2. Seetharam P, Rodrigues G. Sphincter of Oddi and its dysfunction. Saudi J Gastroenterol. 2008;14 (1): 1-6. doi:10.4103/1319-3767.37793 - Free text at pubmed - Pubmed citation
- 3. Kanne JP, Rohrmann CA, Lichtenstein JE. Eponyms in radiology of the digestive tract: historical perspectives and imaging appearances. Part 2. Liver, biliary system, pancreas, peritoneum, and systemic disease. Radiographics. 2006;26 (2): 465-80. doi:10.1148/rg.262055130 - Pubmed citation