Question

In human being, sphincter of oddi is situated in
A) Common bile duct
B) Ampulla of vater
C) Main pancreatic duct
D) Common hepatic duct

Answer 1

Hint: The sphincter of oddi is also called hepatopancreatic sphincter or Glisson’s sphincter. It is a muscular valve that prevents the flow of digestive juices namely bile and pancreatic secretions into the duodenum.

Complete answer:
Sphincters are present in the human body and they regulate the flow of pancreatic and bile juices. Sphincter of pancreatic duct, sphincter of bile duct and sphincter of hepatopancreatic duct are one which release their specific secretions into the duodenum for digestion of food.
Let us analyze the options to find out the locations of sphincter of oddi.

Option A: Common bile duct is a small tube where the cystic duct and common hepatic duct joins. It carries the bile from the gallbladder and releases it into the duodenum.Therefore, this is the incorrect option.

Option B: Ampulla of vater is located at the junction of bile duct and pancreatic dust and empty its content into the second part of duodenum. The sphincter of oddi is situated here and the secretions are released from the ampulla of vater to duodenum through sphincter of oddi regulation.Therefore, this is the correct option.

Option C: Main pancreatic duct which is also called duct of Wirsung is a duct that joins the pancreas to the common bile duct. The sphincter of oddi is not located in them.Therefore, this is the incorrect option.

Option D: Common hepatic duct is a tube that carries bile juice from the liver. It ends where the cystic duct combines with the common bile duct.Therefore, this is the incorrect option.

Thus, the correct option is (B) Ampulla of vater.

Note: Sphincter of Oddi has three major functions,
i) Prevent reflux of duodenal content
ii) Regulation of gallbladder filling
iii) Regulation of flow of bile juice into the duodenum