mesentery


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mesentery:

see peritoneumperitoneum
, multilayered membrane which lines the abdominal cavity, and supports and covers the organs within it. The part of the membrane that lines the abdominal cavity is called the parietal peritoneum.
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Mesentery

 

(mesenterium), a ligament that suspends and fastens the intestines in the body cavity of humans and animals having a coelom (secondary body cavity). The mesentery arises in the embryo from the internal layers of the lateral plates. These layers, growing together over and under the intestinal canal, form two mesenteries—the dorsal and ventral. Only one of these is usually preserved in the adult organism. In invertebrates (segmented worms) the dorsal mesentery is most often reduced and the ventral one is preserved. In vertebrates the dorsal mesentery is most often preserved. Only fishes of the sturgeon family have a ventral mesentery of the intestinal tract; in remaining vertebrates its vestiges are represented by the falciform ligament of the liver. Each lamina of the mesentery in vertebrates consists of a surface layer of squamous epithelial cells and an internal layer of connective tissue. Between the laminae of the mesentery, in the fatty areolar cellular tissue, are located the lymph nodes and also the nerves passing to the intestines, blood vessels, and lymphatic vessels. On the wide folds of the mesentery, along the intestinal loops, the omenta are formed.

In man the mesentery is a fold of the peritoneum, which covers the crus of each intra-abdominal organ; it is also by means of the mesentery that each of these organs is attached to the wall of the abdominal cavity. Outwardly, the mesentary resembles on old-fashioned collar with gathers, bryzhy (from Polish bryże), from which the Russian term bryzheika originated. Depending on the organ, the mesentery acquires a supplementary designation, for example, mesocolon and mesentery of the uterus. The mesentery is fixed at the place where it emerges from the intestinal wall (mesentery root); the other end, to which the intestines are attached, is free and easily movable. Disease processes that arise in the internal organs (edema, phlebitis, tumors, and so forth) cause intense changes in their mesenteries. Traumas of the mesentery are observed in bruises of the abdomen, strangulated hernias, and puncture wounds of the abdominal cavity.

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mesentery

[′mez·ən‚ter·ē]
(anatomy)
A fold of the peritoneum that connects the intestine with the posterior abdominal wall.
References in periodicals archive ?
Benign and borderline cystic mucinous tumours of the mesentery and retroperitoneum are rare, with an incidence of about 1 per 100 000 of hospitalised patients.
Isolated fibers demonstrated various pitch sizes, reflecting the degree of stretch from their native state within the mesentery, which occurred during the extraction procedure (Fig.
During surgery the abdomen was found to be blocked by a severe adhesion syndrome, five intestinal fistulas associated with the presence of multiple bone spicules, and by the ossification of almost all of the mesentery. Adhesiolysis was performed and the entero-cutaneous fistulas were closed.
Sclerosing mesenteritis may involve the bowel wall, just as poorly circumscribed CFTs may adhere to the mesentery. (23,24) The gross inspection again becomes critically important in such cases to determine the lesion as primarily or secondarily involving the mesentery.
Mesentery fat in purebred Santa Ines, Texel x Santa Ines and Bergamasca x Santa Ines males grew more slowly than the empty body, i.e., presenting an allometric coefficient greater than 1 (positive heterogonic growth), confirming the delayed growth of this fat deposit.
These appeared an opening at umbilical area showing defect in muscles and skin, allowing escape of intestine and mesentery. It was managed by washing eviscerated viscera with sterile normal saline solution.
The tumor has a predilection for the omentum and adheres to the hollow viscus, surface of the omentum, mesentery of bowel, or pelvis peritoneum.
Springer determined the cause of death to be blunt trauma of the torso with mesentery laceration and the manner of death to be homicide, according to Ms.
The development of the mesentery starts when the foregut, midgut and hindgut are in broad contact with mesenchyme of the posterior abdominal wall in the fetus.
Intraoperative assessment revealed an infarcted volvulus segment of small bowel with twisted mesentery and proximal obstruction.
Based on patterns known in wolverine and other carnivores (see above), the larger extractable depots would include (paired) perirenal, omentum and mesentery.
Subsequent pelvic computed tomography (CT) and magnetic resonance imaging (MRI) revealed an oval low-density tumour of about 4.0 cm x 3.5 cm in the left lower wall of the bladder, with a clear margin in the mesentery and abdominal wall.