duodenum

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Related to Duodeno: duodenitis, duodenum, pancreas

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 ?
2007), que relataram aumento na altura das vilosidades intestinais do duodeno, jejuno e ileo de codornas japonesas apos inclusao de mananoligossacarideos e acidos organicos na racao; e por IBRAHIM (2011) que, ao testar niveis variando de 0,5 a 2,0ml [L.
Podra evidenciar lesiones purpuricas coalescentes, especialmente en la segunda porcion del duodeno, gastritis (edema difuso de la mucosa, eritema en parches y multiples erosiones) y punteado eritematoso o cambios ulcerativos en el colon (2, 8).
Otros estudios mencionan que la fistula puede cerrarse de forma espontanea y cicatrizarse extensamente sobre el duodeno y la vesicula, con riesgo de lesion biliar.
En nuestro paciente, no se determino por palpacion alguna tumoracion intraabdominal, pero debido a exacerbacion de los vomitos, el cambio en las caracteristicas de los mismos (vomito bilioso oscuro), se sospecho un cuadro suboclusivo ubicado entre la segunda y tercera porcion del duodeno.
En la faena, se procedio al retiro del tubo digestivo, obteniendose de cada ejemplar una muestra de duodeno y otra de yeyuno--ileon que se fijaron en solucion de Bouin y posteriormente se sometieron al procesamiento histologico de rutina.
Esse procedimento combina a reducao do reservatorio gastrico (para aproximadamente 30-50ml), a restricao ao seu esvaziamento por meio do emprego de um anel de contencao e a exclusao do fundo, corpo gastrico, antro, duodeno e uma parte variavel do jejuno proximal.
Una gran mayoria de estos objetos pasan al estomago; los de menos de 5 cm de longitudy 2 cm de diametro pueden atravesar el piloro y ser expulsados, pero si no, pueden ser atrapados en el duodeno, la region del ligamento de Treitz o la valvula ileocecal.
Para los analisis histologicos se selecciono un segmento de 3 centimetros del duodeno, del yeyuno y del ileon (duodeno: desde el piloro hasta la porcion distal de la vuelta duodenal; yeyuno: desde la porcion distal del giro duodenal al diverticulo de Meckel; ileon: desde el diverticulo de Meckel hasta el inicio del ciego).
Alteracion del vaciamiento gastrico: disminucion del vaciamiento, reflujo duodeno gastrico, presencia de sondas de nutricion enteral en infusion, riesgo sangrado gastrointestinal, cambios en pH del estomago, aumentan el riesgo de broncoaspiracion y sus complicaciones.