MICROANATOMY

Detailed explanation-1: -The sphincter of Oddi is a cylindrically shaped smooth muscle located where the distal CBD and the main pancreatic duct meet at the entrance to the duodenum. The role of the sphincter of Oddi is to regulate the flow of bile and pancreatic enzymes into the duodenum by antegrade phasic contractions.

Detailed explanation-2: -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.

Detailed explanation-3: -Anatomical and immunohistochemical investigations have demonstrated that the sphincter of Oddi is richly innervated by cholinergic, adrenergic and peptidergic neurons. In addition, neural connections exist between the sphincter, gallbladder and proximal gastrointestinal tract.