Sphincter of Boyden

The sphincter of Boyden (also known as the choledochal sphincter) is a sphincter located in the common bile duct before it joins with the pancreatic duct to form the ampulla of vater. This sphincter controls the flow of bile into the pancreatic duct and it helps in filling up of the gallbladder with bile.

Sphincter of Boyden
Details
Part ofcommon bile duct
Systemdigestive system
Functioncontrols flow of bile
Anatomical terminology

Structure

The sphincter of Boyden is a smooth muscle sphincter surrounding the common bile duct (ductus choledocus).[1][2] It occurs just before the junction with the pancreatic duct, where the ampulla of Vater is formed.[1] Occasionally, some fibres also surround the pancreatic duct.[2]

It is subdivided into two parts - pars superior and pars inferior. The pars inferior is the strongest component of the sphincter of Oddi complex.[3][4]

      Function

      The sphincter of Boyden controls the flow of bile from the common bile duct into the pancreatic duct.[1] This helps with filling of the gallbladder with bile.

      Its contractions regulate the passage of bile into the gall bladder or the duodenum.[4][3]

      History

      This is named after the American anatomist Edward Allen Boyden (1886-1976).

      References
      1. Nagata, Eiichi; Sakai, Katsuji; Kinoshita, Hiroaki; Hirohashi, Kazuhiro (1986-02-01). "Choledochal cyst: Complications of anomalous connection between the choledochus and pancreatic duct and carcinoma of the biliary tract". World Journal of Surgery. 10 (1): 102–108. doi:10.1007/BF01656096. ISSN 1432-2323. PMID 3962321. S2CID 2765403.
      2. Warrier, Rajkumar K.; Steinheber, Francis U. (1979-01-01). "Afferent loop obstruction presenting as obstructive jaundice". Digestive Diseases and Sciences. 24 (1): 74–76. doi:10.1007/BF01297242. ISSN 1573-2568. PMID 428293. S2CID 27845946.
      3. Corina, Pop; Adina, Purcăreanu; Monica, Purcărea; Dan, Andronescu (2008-04-15). "The functional sphincter of Oddi disorder". Journal of Medicine and Life. 1 (2): 118–129. ISSN 1844-122X. PMC 5654070. PMID 20108458.
      4. Daniel, Edwin E.; Tomita, Tadao; Tsuchida, Seigi; Watanabe, Minoru (1992-04-01). Sphincters: Normal Function-Changes in Diseases. CRC Press. ISBN 978-0-8493-6748-9.
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