Veia porta hepática de Cuniculus paca (Linnaeus, 1766): macroscopia, histomorfometria e ultraestrutura
Carregando...
Arquivos
Data
2012-01-30
Autores
Bosso, Andréa Cristina Scarpa [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
A paca (Cuniculus paca) é o segundo maior roedor da fauna brasileira e tem despertado o interesse dos pesquisadores tanto na obtenção de um novo modelo experimental como também para exploração econômica. No entanto, dados sobre sua morfologia e constituição são raros, principalmente no tocante ao componente venoso intestinal, que contribui para a formação da veia porta hepática. O objetivo desse trabalho foi descrever a formação macroscópica, histomorfometria e ultraestrutura da veia porta hepática de pacas adultas. Para análise macroscópica quatro animais foram injetados com látex corado e descrita a formação da veia porta hepática, que ocorreu através da confluência de quatro troncos principais. As veias ileocólica, cólica média, jejunais e cólica direita uniram-se, formando a veia mesentérica cranial, que se uniu com a veia mesentérica caudal e com o tronco formado pelas veias gastroepiplóica direita com a pancreaticoduodenal cranial, além do tronco formado pelas veias gástrica esquerda, lienal e gastroepiplóica esquerda, na qual chegaram os ramos pancreáticos e, finalmente, as veias gástrica direita e císticas. Antes de adentrar no parênquima hepático, a veia porta hepática se trifurcou em um ramo direito, um ramo intermédio e um ramo esquerdo. A análise histológica contou com sete animais, quatro fêmeas e três machos que, após processamento histológico de suas veias porta hepáticas e o emprego de diversas colorações, observou-se que essa veia apresentou lumen irregular e possuia as túnicas íntima, média, adventícia e uma camada muscular externa na adventícia. Por ser um vaso de grande calibre, apresentou projeções em forma de válvulas na parte interna da veia e abundante tecido elástico. Após análise estatística dos segmentos mensurados, notaram-se variações significativas tanto entre si...
The spotted paca (Cuniculus paca) is the second largest rodent of the Brazilian fauna and has attracted the interest of researchers not only for obtaining a new experimental model, but also for economic exploitation. However, data on their morphology and composition are rare, especially with respect to intestinal venous component, which contributes to the formation of the hepatic portal vein. The objective of this study is to describe the gross anatomy, histomorphometry and ultrastructure of the hepatic portal vein of adult spotted paca. For macroscopic analysis, four animals were injected with colored latex and then, described the formation of the hepatic portal vein, that occurred by the confluence of the four main vessels. The junction of the ileocolic vein, middle colic vein, right colic and jejunal vein formed the cranial mesenteric vein, which joins with the caudal mesenteric vein and the trunk formed by the right gastroepiploic vein with the cranial pancreaticoduodenal vein, besides the trunk formed by the left gastric vein, left gastroepiploic vein and lienal vein, in which reaches the pancreatic branches, and finally, the right gastric and cystic veins. Before entering the liver parenchyma, the hepatic portal vein trifurcates itself in the right branch, intemedium branch and left branch. The histological analysis was composed by seven animals, four females and three males, which, after histological processing of their hepatic portal vein and the use of different stains, were observed that the vein had irregular lumen and had also the intima, media, adventitia layers and an external muscle layer inside the adventitia. As a large caliber vessel, it had projections like valves in the lumen and abundant elastic tissue. In the statistical analysis of its mensured segments, significative variations were noted as among themselves, relatives... (Complete abstract click electronic access below)
The spotted paca (Cuniculus paca) is the second largest rodent of the Brazilian fauna and has attracted the interest of researchers not only for obtaining a new experimental model, but also for economic exploitation. However, data on their morphology and composition are rare, especially with respect to intestinal venous component, which contributes to the formation of the hepatic portal vein. The objective of this study is to describe the gross anatomy, histomorphometry and ultrastructure of the hepatic portal vein of adult spotted paca. For macroscopic analysis, four animals were injected with colored latex and then, described the formation of the hepatic portal vein, that occurred by the confluence of the four main vessels. The junction of the ileocolic vein, middle colic vein, right colic and jejunal vein formed the cranial mesenteric vein, which joins with the caudal mesenteric vein and the trunk formed by the right gastroepiploic vein with the cranial pancreaticoduodenal vein, besides the trunk formed by the left gastric vein, left gastroepiploic vein and lienal vein, in which reaches the pancreatic branches, and finally, the right gastric and cystic veins. Before entering the liver parenchyma, the hepatic portal vein trifurcates itself in the right branch, intemedium branch and left branch. The histological analysis was composed by seven animals, four females and three males, which, after histological processing of their hepatic portal vein and the use of different stains, were observed that the vein had irregular lumen and had also the intima, media, adventitia layers and an external muscle layer inside the adventitia. As a large caliber vessel, it had projections like valves in the lumen and abundant elastic tissue. In the statistical analysis of its mensured segments, significative variations were noted as among themselves, relatives... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Veia porta
Como citar
BOSSO, Andréa Cristina Scarpa. Veia porta hepática de Cuniculus paca (Linnaeus, 1766): macroscopia, histomorfometria e ultraestrutura. 2012. ix, 46 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2012.