Anatomia renal em ovinos: análise do sistema coletor e sua relação com as artérias e veias intrarrenais em moldes de resina de poliéster

• Autor(a) principal: Gonçalves, Gabriela Faria Buys
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/12368
• topic: Kidney; Sheep; Arteries; Veins; Animal model; Rins; Ovino; Artérias; Veias; Modelo animal; CNPQ::CIENCIAS BIOLOGICAS::MORFOLOGIA

Previous studies have shown that porcine kidney heals after partial nephrectomy without the collecting system closure. Recently, a study in sheep kidney demonstrates that in this model, after partial nephrectomy without closure, presents urinary leakage and urinoma, suggesting sheep as a model for the collecting system healing. The aim of this study is to present the detailed anatomy of the intrarenal arteries and veins and its relation with the collecting system in sheep. Eighty-eight kidneys were used for the production of endocasts of the collecting system with intrarenal arteries or veins. There were no calices in any endocast. The collecting system only showed the renal pelvis with many recesses that ranged from 11 to 19 (mode 16). A single renal artery was observed in all cases. The dorsal and ventral branches were classified as type I (most common in the dorsal and ventral views, with segmental cranial and caudal branches), type II (segmental cranial, middle an caudal branches) or type III (cranial, middle cranial, middle caudal and caudal segmental branches). The frequency for the dorsal division type I was 52.64%, for the type II, 34.21%, and 13.16% for the type III. For the ventral division, 55.26% for type I, type II, 31.59%, and 13.16% for the type III. The cranial pole was supplied only by cranial branches of the dorsal and ventral divisions of the renal artery in 73.68% of cases. The caudal pole was only supplied by branches of the caudal dorsal and ventral divisions of the renal artery in all cases. The branching pattern of the caudal pole of sheep kidney supports its use as a model because of the similarity with the human. However, the lack of a retropielic artery discourages the use of the cranial pole of sheep in experiments in which the arteries are an important factor to be considered. The intrarenal veins presented free anastomoses that occurred on 3 different levels, including the surroundings of the recesses in the form of collars. The renal vein of sheep kidney was formed by 2 trunks in 66.7% of cases, 3 trunks in 19,44% of the cases, 1 trunk in 11.08% and 2.78% were formed by 5 trunks. In 23 (63.89%) endocasts, drainage of the cranial and caudal poles in their dorsal and ventral surfaces was performed by venous plexus formed in the same kidney surface. In 11 cases (30.55%), venous drainage related to cranial and/or caudal poles originated from ventral venous plexus only. The pattern of sheep kidney tributary veins supports it as a model for procedures in which the venous injury and its consequences for the parenchyma are an important factor, taking into consideration that the sheep kidney do not have pyelocaliceal system, as in humans.