1. Volume 143, Issue 6, Pages 1423-1426 (December 2012)
Endoscopic Therapy for Sphincter of Oddi Dysfunction in Idiopathic Pancreatitis: From Empiric to Scientific 
C. Mel Wilcox 
Gastroenterology 
Volume 143, Issue 6, Pages (December 2012)
DOI: /j.gastro
Copyright © 2012 AGA Institute Terms and Conditions

2. Figure 1
The sphincter of Oddi. The distal end of the sphincter of Oddi is termed the common channel where the bile and pancreatic duct have fused. Circular and longitudinal muscle fibers surround this common channel. Muscle fibers also surround the distal portion of the biliary and pancreatic sphincters with little overlap between the two. A significant portion of the sphincter lies within the duodenal wall. The biliary sphincter contains circular muscle with some smooth muscle extending past the duodenal wall. The extent of circular muscle surrounding the distal pancreatic duct is variable. Before entering the duodenum, each duct is completely surrounded by circular muscle fibers some of which form a figure-of-8 pattern around the 2 ducts. For a short distance (approximately 2 mm), both ducts are enclosed by a muscle coat of the duodenum.
Gastroenterology  , DOI: ( /j.gastro )
Copyright © 2012 AGA Institute Terms and Conditions