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PubMed1979

[Effect of short-term cerebral ischemia on the microcirculation in the rat mesentery].

The effect of brain ischemia, produced by constriction of the common carotid arteries, on microcirculation in the mesentery was studied in experiments on rats. The spreading and intensity of microcirculatory disturbances were dependent on duration of ischemia and post-ischemia. The state of systemic hemodynamics and microcirculation in the mesentery was compared. Possible mechanisms of the microcirculatory disturbances are discussed.

Animals↗
PubMed1979

[Morphological characteristics of the intramural neural apparatus of the mesentery in neoplasms of the small and large intestines].

The author has studied the nervous elements of the mesentery in various tumors of the large and small intestine. Different structural alterations were found in all the components of the mesentery intramural nervous apparatus: nervous cells, the intracellular plexus, nervous fibres and receptor-structures in all kinds of neoplasms. Various impregnation technics, the Nissle method and routine coloring technics were employed. The variety in pattern of the revealed morphological alterations of the nervous elements and the rate of their involvement are found to be directly dependent on the tumor stage and form, duration of the lesion and the body responsiveness.

Adult↗
PubMed1983

Lymphangioma of the mesentery of the jejunum: report of a case and a brief review of the literature.

Lymphangiomas are benign tumors of lymphatic vessels, that are more commonly found in the pediatric age group, and thought to be congenital in nature. They most commonly occur in the region of the neck, but they frequently may be found in the abdominal cavity. In the abdominal cavity, the tumors usually involve the mesentery of the small or large intestines. They are usually asymptomatic but may present with signs and symptoms of intestinal obstruction. The tumors are rare enough to arouse interest whenever a case is encountered. We present a case of lymphangioma of the mesentery of the jejunum in a young adult which clinically mimicked acute appendicitis.

Acute Disease↗
PubMed1984

[Changes in the microcirculatory bed of the mesentery in the rat in the intestinal form of acute radiation disease (experimental morphologic study)].

Total mesentery preparations of the rat after single total irradiation at the dose levels of 15 and 30 Gy were examined by V. V. Kupriyanov 's method and staining by N.E. Yarigin and S.V. Panchenko . Monotonous pathomorphological changes characteristic of microcirculation disorders were revealed such as blood overdistribution into the venous part of microvasculature prestasis , stasis and lymphostasis. Apart from these qualitative alterations, morphometry of certain parts of microvasculature was performed and some indexes and ratios were calculated. Changes of quantitative parameters were as follows: increase of the capillaries, postcapillaries and venules diameter, increase of their surface and volume, increase of diameter of pericapillary diffusion zone; decrease of the correlation ratio between total arteriolar influx and total venular blood passage within a mesentery segment; decrease of the calculated linear speed of blood in capillaries, postcapillaries and venulas .

Animals↗
PubMedDate not supplied

A gut and mesentery pedicle for bridging lymphatic obstruction: experimental studies.

Experiments have been carried out in the pig. Small bowel and its mesentery are rich in lymphatics. A pedicle of ileum (opened and denuded of its mucosa) and its mesentery has been used to bypass lymphatic obstruction. Diversion of lymphatic drainage from the lower limb into the lymphatics of the bridge has been demonstrated lymphographically in the living animals and also by post mortem injection studies.

Animals↗
PubMed1994

MCF-10A cells infected with the int-2 oncogene induce angiogenesis in the chick chorioallantoic membrane and in the rat mesentery.

A growing body of evidence demonstrates the relevant role of the int-2 (FGF-3) oncogene in human carcinomas. To investigate its angiogenic activity, the human epithelial mammary cell line MCF-10A was infected with a retroviral expression vector carrying the int-2 oncogene. Infected cells were entrapped in an alginate pellet and placed on the chorioallantoic membrane of chick embryos. After 7 days, a dense capillary network was found to grow toward the pellet, whereas parental cells did not show any angiogenic activity. Conditioned medium from int-2-infected cells was injected i.p. twice daily into rats over a period of 10 days. The mesentery of treated rats showed numerous small blood vessels originating from larger vascular arcades and growing through the stromal layer of the mesentery. In control experiments, neither medium for cell culture nor conditioned medium from parental cells was found to induce angiogenesis. In conclusion, the stimulation of blood vessel growth by int-2-infected cells suggests that the production of the int-2 protein is associated with the acquisition of the angiogenic phenotype.

Allantois↗
PubMed1995

[A case of spontaneous mesenteric fibromatosis occurred from the mesentery of the small intestine].

The fibromatosis is benign tumor which is characterized by the remarkable proliferation and the invasive growth of fibrous tissue and no distant metastasis. It usually occurs from the abdominal wall or the extremities, and rarely from the mesentery. A 54-year-old male complained of an epigastralgia and emesis. He was diagnosed through imaging as the obstructive ileus by abdominal tumor. The laparotomy was performed and a round, egg sized tumor was found wear by dilated ileum. The tumor was considered to occur from the mesentery, and the iliectomy with the tumor was completed. It was suggested that ileus occurred in the early stage because the tumor was located just by the ileum.

Fibromatosis, Abdominal↗
PubMed1994

[Huge leiomyosarcoma of the mesentery: a case report].

A patient, a 63 year-old-man, was admitted suffering from discomfort in the left abdominal area; this proved to be a case of leiomyosarcoma of the mesentery. An upper gastrointestinal series revealed stenosis in the 3rd portion of the duodenum, and shift of the entire intestine to the right side. Computed tomography showed a giant mass lesion with a central necrosis. Selective arterial angiography showed a heterogeneous tumor stain with several feeders and drainage veins. A partial resection of the intestine around the Treitz's ligament and left hemicolectomy was required due to the tumor's invasion of the intestinal wall and transverse colon. The operation was successfully performed supported by the angiographic findings. The resected tumor was 23 cm in diameter, 2330 g in weight, and was filled with blood. The histological diagnosis was leiomyosarcoma of the mesentery. The patient has been doing well during the 6 months postoperative period.

Humans↗
PubMed1994

[Cystic lymphangioma of the mesentery].

Cystic lymphangioma of the mesentery is a rare congenital lesion with a relatively low growth potential. It is typically found in young adults, and thereby excluded from other, more aggressive lymphatic malformations seen in newborns. Symptoms of onset may be dramatic and sudden, but are often preceded by an interval of diffuse abdominal discomfort, possibly associated with loss of weight and a palpable abdominal mass. The multicystic architecture of the lesion is clearly visible on an abdominal CAT-scan and indicates the diagnosis. Percutaneous drainage of the cysts has neither diagnostic nor therapeutic effects. Radical excision of the expansion may include resection of the related intestinal segment. Lymphangioma of the mesentery is not malignant. We suggest an ultrasound follow-up six months after the intervention to establish whether the surgery has been successful.

Adult↗
PubMed1993

Benign cystic teratoma of mesentery.

Benign cystic teratomas are the commonest germ cell tumors in gonads but are rare in extragonadal sites and very rare in the mesentery. Herein is reported a case of primary benign cystic teratoma of the mesentery in a 10 year old girl.

Child↗
PubMed1993

[CT findings of invaginated mesentery in adult intussusception].

The CT findings of invaginated mesentery in adult intussusception were analyzed in 12 patients (three patients with four small bowel intussusceptions and nine patients with nine large bowel intussusceptions). In all small bowel intussusceptions, the neck was located near the superior mesenteric artery and vein (SMA & SMV) and showed a medial opening, and the vessels in the neck showed a continuity to the left side of SMA & SMV. In most of the large bowel intussusceptions, the neck was located distant from SMA & SMV, and the vessels in the neck did not show continuity to SMA & SMV. The difference in CT findings between small and large bowel intussusception is attributed to the difference in mesenteric anatomy; the small bowel and its mesentery move freely in the peritoneal cavity, whereas the large bowel is partially fixed to the retroperitoneum.

Adult↗
PubMed1993

Is sympathetic neurotransmission in the rat mesentery modulated by prejunctional beta adrenoceptors?

The influence of prejunctional beta adrenoceptors on neurotransmitter overflow from the sympathetic nerve terminals of the normotensive rat mesentery was investigated. The mesenteric vascular bed was isolated and perfused with Krebs-bicarbonate buffer containing phentolamine (10 microM), cocaine (10 microM) and corticosterone (40 microM). Periarterial nerve stimulation (2 Hz, 120 pulses) was performed at 8-min intervals. The influence of isoproterenol (ISO) on the stimulus-induced fractional overflow of norepinephrine (S-I OFLO) was determined by generating concentration-effect curves (0.1-1000 nM, 3- or 6.5-min exposure to each concentration). ISO did not significantly increase S-I OFLO at any concentration. On the contrary, there was a decrease in S-I OFLO at the highest concentration of ISO (1 microM). The time course of the actions of ISO was studied by utilizing single concentrations of ISO (10 nM or 1 microM, 6.5-min exposure). The presence of ISO did not significantly affect S-I OFLO at either concentration. However, S-I OFLO was decreased during stimulation periods after the removal of ISO (1 microM) from the perfusate. This inhibition was significantly attenuated by propranolol (1 microM). Pretreatment with the cyclooxygenase inhibitor indomethacin (2.8 microM) had no effect on the response to ISO or the inhibition observed after ISO removal. This inhibition remained sensitive to blockade by propranolol. Salbutamol (100 nM, 6.5-min exposure), a preferential beta 2 adrenoceptor agonist, did not facilitate or inhibit S-I OFLO. These data suggest that facilitatory prejunctional beta adrenoceptors are either not present or weakly coupled to their effector system in the normotensive rat mesentery.(ABSTRACT TRUNCATED AT 250 WORDS)

Albuterol↗
PubMed1996

CT scan of mesentery-omentum peritoneum.

The peritoneal cavity and its specialized folds, the mesentery and omentum, are often involved in infectious, neoplastic, and traumatic conditions. Abnormalities in the development of these structures may also result in pathologic conditions. CT scans are often the modality of choice for evaluation of many of these entities. The following discussion reviews the normal anatomy and the CT features of disease processes that involve the peritoneal cavity, mesentery, and omentum in children. Identification and characterization of these pathologic conditions depend on knowledge of the normal appearance of the peritoneal cavity and its specialized folds and familiarity with the anatomic pathways for spread of disease.

Child↗
PubMed1976

[Adrenergic terminal structures in mamalian mesentery].

The work is devoted to the study of adrenergic terminal structures in the mesentery of mammals by fluorescent microscopy of catecholamines. The system of adrenergic innervation of the mesentery proved to be based on well-developed perivascular plexuses. In many points of these plexuses individual adrenergic fibers penetrated the avascular mesenteric areas, where they formed preterminal and terminal portions as a result of repeated dichotomic divisions. These innervating structures built by the principle of widespread or restricted arborizations displayed morphological similarity to free sensory nerve endings. In this connection a possibility of distinction of the sensory (afferent) links in the catecholamine-containing vegetative nerve plexuses is discussed.

Animals↗
PubMed1976

[Influence of salivary kallikreins on microvessels of the hamster cheek pouch and rat mesentery].

By means of in vivo microscopy the influence of human, rat, and hamster purified salivary kallikreins upon the microvessels was studied in rat mesentery and hamster cheek pouch. Dilatation of arterioles, a decrease of the venule diameter, and an increase in the number of active capillaries was revealed. The species and organ peculiarities of these effects were described. The mesentery and the cheek pouch homogenates, albumin proteins, histamine and some amino acids were capable of activating the salivary kallikreins.

Animals↗
PubMed2001

Endothelial K(ca) channels mediate flow-dependent dilation of arterioles of skeletal muscle and mesentery.

The role of Ca(2+)-activated potassium channels (K(Ca)) in flow-initiated intracellular events in microvessels is not known. We hypothesized that K(Ca) channels in the arteriolar endothelium are responsible for the mechanotransduction of flow/shear stress-induced arteriolar dilation in skeletal muscle and mesentery of rats. The active diameter of arterioles isolated from gracilis (80 mm Hg) and cremaster (60 mm Hg) muscles and mesentery (80 mm Hg) at a constant intraluminal pressure was 53 +/- 3, 77 +/- 5, and 72 +/- 6 microm, respectively. Their passive diameter (in Ca(2+)-free solution) was 113 +/- 3, 152 +/- 12, and 121 +/- 7 microm, respectively. At a constant intraluminal pressure stepwise increases in perfusate flow (25, 40, and 14 microL/min in 5, 10, and 2 microL/min steps) elicited a gradual increase in diameter of all three groups of arterioles up to 93 +/- 5, 137 +/- 11, and 102 +/- 7 microm, respectively. Flow-induced dilations of arterioles were eliminated by intraluminal administration of iberiotoxin (ibTX 10(-9) M), an inhibitor of high conductance K(Ca) channels (BK(Ca)). In contrast, arteriolar dilations to acetylcholine and sodium nitroprusside were not altered by this agent, indicating that BK(Ca) channels are not involved in the receptor-mediated endothelial synthesis of nitric oxide (NO) and that the inhibitor did not affect the action of NO on smooth muscle. Abluminal application of ibTX (10(-8) M) did not affect flow-dependent dilation. We conclude that in arterioles of several tissues activation of endothelial BK(Ca) channels is an obligatory step in the transduction of the signal initiated by changes in intraluminal flow/shear stress, leading to the release of endothelial factors evoking dilation.

Animals↗
PubMed1984

Analysis of the wall permeability of blood vessels in the rat mesentery.

The transport of fluorescent tracer molecules of various molecular weights (MW 340-300,000) within the blood vessels and through the vessel walls into the perivascular tissue of the rat mesentery was studied microscopically. Using a highly sensitive TV-tube the fluorescence intensities were transformed into video signals and recorded for subsequent analysis. The results show that small molecules, such as the water-soluble dye fluorescein-sodium ( F1Na ) (MW 340) can pass through the wall of all blood vessels with minimal delay, whereas the passage of large molecules, such as the serum proteins (MW greater than 60,000), depends very strongly on the diameter of the vessels and on the medium in which the mesentery is embedded during the observation. In this respect, no difference was registered between vessels of the arterial and of the venous part of the microcirculation. The large serum protein molecules moved through the blood vessel walls at specific leakage points. The small dye molecules, however, traversed the wall uniformly along the entire length of the blood vessel. The small-molecule behavior could be described by a passive diffusion model with a cylindrical diffusion source.

Animals↗
PubMed2006

The effect on morbidity of mesentery lengthening techniques and the use of a covering stoma after ileoanal pouch surgery.

PURPOSE: A tension-free anastomosis in a restorative proctocolectomy requires sufficient length of small-bowel mesentery. To ensure adequate length, it has been proposed that the superior mesenteric artery be divided and the right colon marginal vascular arcade be preserved. This study was designed to evaluate the influence of mesenteric lengthening techniques on the need for a stoma and on early outcomes after restorative proctocolectomy. METHODS: Records of patients who had a restorative proctocolectomy between January 1998 and October 2003 were reviewed. Patient and disease characteristics, operative techniques and findings, the need for a stoma, and postoperative complications were recorded. RESULTS: In one patient a restorative proctocolectomy was not possible. The remaining 220 patients were divided into two groups: Group A (inflammatory bowel disease; n = 123) and Group B (noninflammatory bowel disease; n = 97). Sixty-nine patients (31.4 percent) had major comorbidities. A lengthening technique was performed in 120 patients (54.5 percent) by dividing the ileocecal artery (n = 37) or the superior mesenteric artery (n = 88); 5 patients had only the marginal vascular arcade preserved. An ileostomy was not required in 116 patients (52.7 percent). In multivariate analysis, in Group B the only surgical variable influencing the need for an ileostomy was preservation of the marginal vascular arcade (50 vs. 14.7 percent; P < 0.0005). Complications occurred in 41 patients (18.6 percent), more frequently for those in Group A and for patients receiving steroids (23.6 vs. 12.4 percent, P = 0.012; 10.4 vs. 6.8 percent, P = 0.0172). CONCLUSIONS: The use of mesentery lengthening techniques allows a restorative proctocolectomy to be performed in almost all patients without increasing morbidity and may reduce the number of covering stomas. Because division of the ileocecal and/or superior mesenteric arteries may be required, preservation of the marginal vascular arcade is essential whenever possible.

Adolescent↗