科研之友
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摘要
Liver samples of Oreochromis niloticus cultivated in floating net cages were fixed for histological and ultrastructural studies with the objective of describing the hepatic parenchymal structure and the intrahepatic exocrine pancreatic tissue. Anatomically, the liver showed only two hepatic lobes. Histological analysis demonstrated that the hepatocytes were spread out as anastomotic cords, arranged in two cellular layers and surrounded by sinusoids. The intrahepatic exocrine pancreatic tissue exhibited an acinar arrangement and was diffused in the hepatic parenchyma. Structural analysis showed that the hepatocytes had a rounded nucleus and a rough endoplasmic reticulum with a parallel disposition to the nuclear membrane. The exocrine pancreatic cells showed secretion granules at the apical portion and the rough endoplasmic reticulum was concentrically distributed Con el objetivo de describir la estructura del par谷nquima hep芍tico y del p芍ncreas exocrino intrahep芍tico del Oreochromis niloticus, fueron fijados para estudios histol車gicos y ultraestructurales fragmentos de h赤gado de peces cultivados en jaulas flotantes. Se evidenciaron s車lo 2 l車bubos hep芍ticos. El an芍lisis histol車gico demostr車 que los hepatocitos se encontraban organizados en forma de cordones anastomosados, dispuestos en dos capas celulares y cercados por sinusoides. El tejido pancre芍tico exocrino intrahep芍tico se encontr車 difuso en el par谷nquima hep芍tico y se destac車 por su organizaci車n acinar. El an芍lisis ultraestructural demostr車 que los hepatocitos presentaban n迆cleos redondos y el ret赤culo endoplasm芍tico rugoso estaba dispuesto paralelamente a la membrana nuclear. Las c谷lulas pancre芍ticas exocrinas presentaban gr芍nulos de secreci車n localizados en la porci車n apical y el ret赤culo endoplasm芍tico rugoso estaba organizado de manera conc谷ntrica
