Sphincter of Oddi

From Wikipedia, the free encyclopedia
Jump to: navigation, search
sphincter of Oddi
Interior of the descending portion of the duodenum, showing bile papilla.
Latin m. sphincter ampullae
MeSH A03.
TA A05.8.02.018
FMA 15077
Anatomical terminology

The sphincter of Oddi (or hepatopancreatic sphincter), abbreviated as SO,[1] is a muscular valve that controls the flow of digestive juices (bile and pancreatic juice) through the ampulla of Vater into the second part of the duodenum. It is named after Ruggero Oddi.[2] The sphincter of Oddi is relaxed by the hormone cholecystokinin[3] via vasoactive intestinal peptide.[4]

Clinical significance[edit]

Opiates can cause spasms of the sphincter of Oddi, leading to increased serum amylase levels.

Other animals[edit]

In many mammals (including mice, guinea pigs, dogs and opossums), the smooth muscle around the ampulla of Vater does not form a sphincter.[5]


The sphincter was described for the first time by Ruggero Oddi when he was a young student in 1887. This followed extensive research on the physiology of dogs and had made detailed histological examinations of humans, and many other species.[1]


  1. ^ a b Yamada 2011, p. 78.
  2. ^ synd/2709 at Who Named It?
  3. ^ Board Review Series (5th ed.). Lippincott Williams & Wilkins medical. March 2006. p. 220. ISBN 978-0781798761. 
  4. ^ Wiley, J W; O'Dorisio, T M; Owyang, C (1988). "Vasoactive intestinal polypeptide mediates cholecystokinin-induced relaxation of the sphincter of Oddi". Journal of Clinical Investigation. 81 (6): 1920–4. doi:10.1172/JCI113539. PMC 442644free to read. PMID 3384954. 
  5. ^ Higashiyama H, Sumitomo H, Ozawa A, Igarashi H, Tsunekawa N, Kurohmaru M, Kanai Y. (2016). Anatomy of the Murine Hepatobiliary System: A Whole-Organ-Level Analysis Using a Transparency Method. The Anatomical Record. 299(2):161-172. doi:10.1002/ar.23287 PMID 26559382
  • Gray's Anatomy, 39th ed. p. 1228.


Further reading[edit]