Biology:Major duodenal papilla
|Major duodenal papilla|
Interior of the descending portion of the duodenum, showing bile papilla.
The pancreatic duct.
|Latin||papilla duodeni major|
The major duodenal papilla (papilla of Vater) is a rounded projection in the duodenum into which the common bile duct and pancreatic duct drain. The major duodenal papilla is, in most people, the primary mechanism for the secretion of bile and other enzymes that facilitate digestion.
The major duodenal papilla is situated in the second part of the duodenum, 7–10 cm from the pylorus, at the level of the second or third lumbar vertebrae. It is surrounded by the sphincter of Oddi, a circular muscle, and receives a mixture of pancreatic enzymes and bile from the Ampulla of Vater, which drains both the pancreatic duct and biliary system. The junction between the foregut and midgut occurs directly below the major duodenal papilla. :274 The major duodenal papilla projects less than a centimetre into the lumen of the duodenum. It appears rounded and is often covered by a fold on the uppermost side of the papilla; that is, the side which receives contents from the stomach.
The major duodenal papilla is seen from the duodenum as lying within a mucosal fold. The minor duodenal papilla is situated 2 cm proximal.
The major duodenal papilla is occasionally found in the junction between the descending and horizontal parts of the duodenum, or in the horizontal part of the duodenum; a case study of 1000 people demonstrated this in 12 and 8% respectively. in the third part of the duodenum, the level of the vertebrae may be L2-3, and in about 10% of people, it may not receive bile. Additionally, in a small number of people, the primary papilla for draining the pancreas may in fact be the accessory pancreatic duct.
Pancreatic enzymes and bile drain into the duodenum from both the pancreatic duct and biliary system. This facilitates the digestion of food; particularly proteins (pancreatic enzymes), and fat-soluble vitamins (bile).
The minor papilla drains the duct of Santorini, superior in position to the major papilla. In pancreatic divisum, in which the minor papilla drains the bulk of pancreatic secretions and major drains a minority of secretions (opposite of normal), a Santorinicele may develop leading to obstructed secretions/reflux resulting in pancreatitis.
- Skandalakis, editor in chief John E. (2004). Skandalakis' surgical anatomy : the embryologic and anatomic basis of modern surgery. Athens, Greece: PMP. pp. Chapter 16: Small Intestine; Chapter 21:Pancreas, sections titled "Major duodenal papilla". ISBN 9603990744.
- Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students. Philadelphia: Elsevier/Churchill Livingstone. ISBN 978-0-8089-2306-0.
- Horiguchi, Shin-ichiro; Kamisawa, Terumi (2010). "Major Duodenal Papilla and Its Normal Anatomy" (in en). Digestive Surgery 27 (2): 90–93. doi:10.1159/000288841. ISSN 1421-9883. PMID 20551649. https://www.karger.com/Article/FullText/288841.
- Pancreas at The Anatomy Lesson by Wesley Norman (Georgetown University)
- digest-019—Embryo Images at University of North Carolina
- Swiss embryology (from UL, UB, and UF) sdigestive/pankreas01
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