duodenum


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Related to duodenum: pancreas, duodenitis

duodenum:

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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.

Duodenum

 

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.

duodenum

[dü′äd·ən·əm or dü·ə′dē·nəm]
(anatomy)
The first section of the small intestine of mammals, extending from the pylorus to the jejunum.

duodenum

the first part of the small intestine, between the stomach and the jejunum
References in periodicals archive ?
In the present study, the lesion score was significantly reduced in the duodenum, jejunum and caeca of the infected birds in response to treatments showing the effectiveness of the natural additives.
05) were also confirmed in height and the surface area of villi as well as crypt depth in the jejunum and ileum in day-old broiler chickens, but these differences were not as predominant as in the case of the duodenum (Table 2).
A pathologic examination revealed mucosal ulceration and a submucosal hematoma in the duodenum.
2,3 We present four cases of endoscopic and histological pseudomelanosis duodeni with one case representing both pseudomelanosis of duodenum and the gastric antrum.
6 Magnetic resonance imaging (MRI) can be used to identify malrotation by revealing dilation of the proximal duodenum, a non-retroperitoneal positioning of the duodenum, malposition of the bowel, or inversion of the SMA/SMV relationship.
from the dorsal and ventral pancreatic buds originating from the duodenum (2, 3, 11, 19, 20, 31).
This study was designed to evaluate the potentiation of prokinetic activity of metoclopramide by an H2 blocker ranitidine on isolated duodenum of rabbits.
The anatomical relationship of duodenum makes diagnosis and treatment of isolated duodenal injury a difficult task.
They are considered to lead to bile stasis and to allow reflux from the duodenum into the bile duct, which can result in an ascending infection [4].
There was a significant circumferential wall thickening involving the duodenum without any vascular encroachment or invasion.
The axial CT images and T2 weighted sequences confirmed that the distal duodenum with surrounding fat, vessels, and the pancreatic head were invaginated into the proximal jejunum.