Question

Where is sphincter of Boyden located?

Answer 1

Sphincters are specialized muscles found in the upper esophagus (upper esophageal sphincter (UES)), the gastroesophageal junction (lower esophageal sphincter (LES)), the gastroduodenal junction (pylorus), the ileocecal junction (ICJ), and anus (anal sphincter).

Complete answer:
A sphincter is a circular muscle that normally constricts a natural body passage or orifice and relaxes as needed for normal physiological functioning. Within the digestive system, there are six different sphincters.

The Boyden sphincter is located in the bile duct near the hepatopancreatic ampulla and is divided into inferior and superior sphincters. It controls the flow of bile from the liver to the duodenum. Bile travels from the liver to the small intestine to aid in fat digestion.

The pancreatic duct and the common bile duct join to form the ampulla of Vater, also known as the hepatopancreatic ampulla or the Hepatopancreatic duct. The ampulla is located specifically at the major duodenal papilla.

The cystic duct emerges from the gallbladder and connects to the common hepatic duct to form the common bile duct. This duct eventually connects with the pancreatic duct, forming the ampulla of Vater. The pancreatic duct transports bicarbonate and digestive enzymes to the duodenum.

Note: When the sphincter of Oddi closes, newly synthesized bile from the liver is forced into the gallbladder for storage. When the valve is opened, the stored and concentrated bile drains into the duodenum. The main function of the common bile duct is bile conduction. When stimulated by a fatty meal, the hormone cholecystokinin promotes bile secretion by increasing hepatic bile production and contraction of the gallbladder and relaxation of the sphincter of Oddi.