Sphincter of Oddi

Dr Henry Knipe et al.

The sphincter of Oddi (or sphincter of ampulla) 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

Abdominal and pelvic anatomy
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Article information

rID: 25185
Section: Anatomy
Synonyms or Alternate Spellings:
  • Hepatopancreatic ampulla sphincter
  • Sphincter of ampulla

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