Jump to navigation Jump to search

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Template:Infobox Anatomy

WikiDoc Resources for Duodenum


Most recent articles on Duodenum

Most cited articles on Duodenum

Review articles on Duodenum

Articles on Duodenum in N Eng J Med, Lancet, BMJ


Powerpoint slides on Duodenum

Images of Duodenum

Photos of Duodenum

Podcasts & MP3s on Duodenum

Videos on Duodenum

Evidence Based Medicine

Cochrane Collaboration on Duodenum

Bandolier on Duodenum

TRIP on Duodenum

Clinical Trials

Ongoing Trials on Duodenum at Clinical Trials.gov

Trial results on Duodenum

Clinical Trials on Duodenum at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Duodenum

NICE Guidance on Duodenum


FDA on Duodenum

CDC on Duodenum


Books on Duodenum


Duodenum in the news

Be alerted to news on Duodenum

News trends on Duodenum


Blogs on Duodenum


Definitions of Duodenum

Patient Resources / Community

Patient resources on Duodenum

Discussion groups on Duodenum

Patient Handouts on Duodenum

Directions to Hospitals Treating Duodenum

Risk calculators and risk factors for Duodenum

Healthcare Provider Resources

Symptoms of Duodenum

Causes & Risk Factors for Duodenum

Diagnostic studies for Duodenum

Treatment of Duodenum

Continuing Medical Education (CME)

CME Programs on Duodenum


Duodenum en Espanol

Duodenum en Francais


Duodenum in the Marketplace

Patents on Duodenum

Experimental / Informatics

List of terms related to Duodenum

In anatomy of the digestive system, the duodenum is a hollow jointed tube connecting the stomach to the jejunum. It is the first and shortest part of the small intestine and it is where most chemical digestion takes place. It begins with the duodenal bulb and ends at the ligament of Treitz. The name duodenum is from the Latin duodenum digitorum, twelve fingers' breadths or inches.


The duodenum is largely responsible for the breakdown of food in the small intestine. Brunner's glands, which secrete mucus, are found in the duodenum. The duodenum wall is composed of a very thin layer of cells that form the muscularis mucosae. The duodenum is almost entirely retroperitoneal. The pH in the duodenum is approximately six.


The duodenum is divided into four sections for the purposes of description. The first three sections form a "C" shape.

First part

The first (superior) part began as a continuation of the duodenal end of the pylorus. From here it passes laterally (right), superiorly and posteriorly, for approximately 5 cm, before making a sharp curve inferiorly into the superior duodenal flexure (the end of the superior part). It is intraperitoneal.

Second part

The second (descending) part of the duodenum begins at the superior duodenal flexure. It passes inferiorly to the lower border of vertebral body L3, before making a sharp turn medially into the inferior duodenal flexure (the end of the descending part).

The pancreatic duct and common bile duct enter the descending duodenum, commonly known together as the hepatopancreatic duct (or pancreatic duct in the United States), through the major duodenal papilla. This part of the duodenum also contains the minor duodenal papilla, the entrance for the accessory pancreatic duct. The junction between the embryological foregut and midgut lies just below the major duodenal papilla.

Third part

The third (inferior/horizontal) part of the duodenum begins at the inferior duodenal flexure and passes transversely to the left, crossing the inferior vena cava, aorta and the vertebral column.

Fourth part

The fourth (ascending) part passes superiorly, either anterior to, or to the right of, the aorta, until it reaches the inferior border of the body of the pancreas. Then, it curves anteriorly and terminates at the duodenojejunal flexure where it joins the jejunum. The duodenojejunal flexure is surrounded by a peritoneal fold containing muscle fibres: the ligament of Treitz.

Additional images


1. Please don't erase this: In an episode of Tak and the Power of Juju, Jibolba says, "Oh, my duodenum!" referring to his duodenum being hurt.

External links

Template:Digestive system

ca:Duodè da:Tolvfingertarm de:Duodenum eo:Duodeno fa:دوازدهه hr:Dvanaesnik id:Usus dua belas jari it:Duodeno he:תריסריון la:Duodenum lt:Dvylikapirštė žarna hu:Patkóbél mk:Дванаесетпалечно црево nl:Twaalfvingerige darm no:Tolvfingertarmen nn:Tolvfingertarmen simple:Duodenum sk:Dvanástnik sl:Dvanajstnik sr:Дванаестопалачно црево fi:Pohjukaissuoli sv:Tolvfingertarm

Template:WikiDoc Sources