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Related to Duodeno: duodenitis, duodenum, pancreas


see intestineintestine,
muscular hoselike portion of the gastrointestinal tract extending from the lower end of the stomach (pylorus) to the anal opening. In humans this fairly narrow (about 1 in./2.
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; pancreaspancreas
, glandular organ that secretes digestive enzymes and hormones. In humans, the pancreas is a yellowish organ about 7 in. (17.8 cm) long and 1.5 in. (3.8 cm) wide. It lies beneath the stomach and is connected to the small intestine at the duodenum (see digestive system).
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the first section (individually distinct in man, mammals, and birds) of the small intestine, from the pylorus to the jejunum.

The length of the duodenum in man is approximately 25–30 cm (the width of about 12 fingers—hence the name); its volume is 150–250 ml. The wall of the duodenum consists of three layers: the inner layer of mucous membrane, the middle layer of muscular membrane, and the external layer of serous membrane. The mucous membrane forms numerous transverse folds, its surface studded with villi; it contains cells that manufacture an intestinal juice containing enzymes that break down proteins, fats, and carbohydrates; it also contains enterokinase, which converts trypsinogen, the inactive enzyme of pancreatic juice, to the active trypsin. In the wall of the upper portion of the duodenum are the so-called Brun-ner’s glands, which, in structure and in the composition of the juice they secrete, are closely related to the glands of the pyloric portion of the stomach. The effluent ducts of the pancreas and liver open into the duodenal cavity through a common aperture. The acidic, gruel-like food mass (chyme) passing from the stomach continues to be digested in the duodenum under the influence of enzymes of the alkaline pancreatic and intestinal juices. Proteins are broken down into amino acids, carbohydrates into monosaccharides, and fats into glycerol and fatty acids. Bile promotes the digestion and absorption of fats. Through the walls of the villi the products of proteolysis and glycolysis enter the blood; the products of lypolysis enter the lymph. In the walls of the duodenum an inactive substance is formed (prosecretin) which, under the action of hydrochloric acid entering from the stomach, is converted to the biologically active secretin. Upon entering the blood secretin, acting along with the sympathetic nervous system, stimulates the secretion of pancreatic juice. Ulcer is the most common disease of the duodenum.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


[dü′äd·ən·əm or dü·ə′dē·nəm]
The first section of the small intestine of mammals, extending from the pylorus to the jejunum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


the first part of the small intestine, between the stomach and the jejunum
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Comparando o comprimento do duodeno entre os sexos, nao foi observada diferenca estatistica.
A reducao da ingestao de nutrientes, diminuicao de acido, pepsina e fator intrinseco pela reducao do estomago e pela exclusao do meio acido do estomago e da superficie absortiva do duodeno e do jejuno proximal, esta relacionada com fisiologia das deficiencias desses nutrientes.
Visualizou-se alteracoes histopatologicas em ambos os grupos (controle e teste), porem os que nao receberam glicerina na dieta apresentaram-na em menor grau de intensidade, exceto na porcao do duodeno, em que dois animais do grupo controle exibiram alteracoes, um foi classificado como grau 1 (leve) e o outro grau 2 (levemente moderada), mas sem diferenca significativa (Tabela 03), ja no grupo teste todos exibiram grau igual a zero, considerado normal (sem alteracoes), nesse segmento do intestino delgado.
nasalis son de color amarillo y se ubican en la mucosa de la region antropilorica y porcion proximal del duodeno (7,32,33,39)
Latin American articles written in Spanish or Portuguese were also reviewed with LILACS's database search engine with the terms "gossypiboma" and "gossypiboma y duodeno" used in the search.
In January, officials at Virginia Mason Hospital in Seattle, Wash., acknowledged that 32 patients had been infected with a dangerous bacteria via duodeno scopes from November 2012 to early 2014.