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Transmission electron microscopy of the gastrointestinal tract of Nile perch Lates niloticus / Uso de microscopía electrónica de transmisión para visualizar el tracto gastrointestinal de la perca del Nilo Lates niloticus
Namulawa, V. T; Kato, C. D; Nyatia, E; Rutaisire, J; Britz, P. J.
  • Namulawa, V. T; Aquaculture Research and Development Center. Kampala. UG
  • Kato, C. D; Makerere University. Animal Resources and BioSecurity. College of Veterinary Medicine. Kampala. UG
  • Nyatia, E; Makerere University. Animal Resources and BioSecurity. College of Veterinary Medicine. Kampala. UG
  • Rutaisire, J; National Agricultural Research Organization. Entebbe. UG
  • Britz, P. J; Rhodes University. Department of Ichthyology & Fisheries Science. Grahamstown. ZA
Int. j. morphol ; 33(2): 751-758, jun. 2015. ilus
Article in English | LILACS | ID: lil-755539
ABSTRACT
The ultrastructure of the gastrointestinal tract of Nile perch was described using Transmission Electron Microscopy standard procedures. Investigations revealed the presence of mucous cells, blood vessels and oil droplets plus several nerve cells and muscle bundles in the oral cavity. Further observations revealed columnar epithelial cells in the oesophagus, with a ragged surface, high electron dense cytoplasm, intercellular spaces, mitochondria and mucus granules. The lamina propria of the oesophagus was composed of loose connective tissue, blood vessels, nerve cells and several leucocytes, while the muscularis externa was composed of striated muscle bundles with the a Z line, A band and I band. The stomach was characterized by mucosal glandular cells with electron dense granules, a prominent nucleus, mitochondria, and secretory canaliculi. The liver had an isotropic parenchyma composed of several hepatocytes with a single spherical euchromatic nucleus. The exocrine pancreatic cells in the liver occurred around large blood vessels, had large centrally positioned nuclei with electron dense nucleolus, electron dense granules, Rough Endoplasmic Reticulum, and mitochondria which dominated the cytoplasm of pancreatic cells.
RESUMEN
La ultraestructura del tracto gastrointestinal de la perca del Nilo fue descrita utilizando un procedimiento estándar de Microscopía Electrónica de Transmisión (MET). Las investigaciones revelaron la presencia de células mucosas, vasos sanguíneos y pequeñas gotas de aceite, además de varias células nerviosas y haces musculares en la cavidad oral. Nuevas observaciones revelaron células epiteliales columnares en el esófago, con una superficie irregular, citoplasma elevado y electrodenso, espacios intercelulares, mitocondrias y gránulos mucosos. La lámina propia del esófago se compone de tejido conectivo laxo, vasos sanguíneos, células nerviosas y numerosos leucocitos, mientras que la muscular externa se compone de haces musculares estriados, con presencia de la línea Z, banda A y banda I. El estómago se caracteriza por presentar células glandulares mucosas con gránulos electrodensos , un núcleo prominente, mitocondrias y canalículos secretores. El hígado presentó un parénquima isotrópico compuesto de varios hepatocitos con un solo núcleo eucromático y esférico. Las células pancreáticas exocrinas se encontraron alrededor de grandes vasos sanguíneos, presentando grandes núcleos posicionados centralmente, con nucleólos densos, gránulos electrodensos en el retículo endoplasmático rugoso, y mitocondrias, que dominaron el citoplasma de las células pancreáticas.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Perches / Gastrointestinal Tract / Microscopy, Electron, Transmission Limits: Animals Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2015 Type: Article Affiliation country: South Africa / Uganda Institution/Affiliation country: Aquaculture Research and Development Center/UG / Makerere University/UG / National Agricultural Research Organization/UG / Rhodes University/ZA

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Full text: Available Index: LILACS (Americas) Main subject: Perches / Gastrointestinal Tract / Microscopy, Electron, Transmission Limits: Animals Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2015 Type: Article Affiliation country: South Africa / Uganda Institution/Affiliation country: Aquaculture Research and Development Center/UG / Makerere University/UG / National Agricultural Research Organization/UG / Rhodes University/ZA