Morphology, histology and histochemistry of the digestive system of south american catfish (Rhamdia quelen)

• Autores: Hernández, David Roque; Pérez Gianeselli, Mónica Raquel; Domitrovic, Hugo Alberto
• Año de publicación: 2009
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: International Journal Morphology, 2009, vol. 27, no. 1, p. 105-111.
• Materia: Rhamdia quelen; Histology; Digestive system
• Institución: Universidad Nacional del Nordeste

Fil: Hernández, David Roque. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias; Argentina.
Fil: Hernández, David Roque. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico; Argentina.
Fil: Pérez Gianeselli, Mónica Raquel. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias; Argentina.
Fil: Domitrovic, Hugo Alberto. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias; Argentina.
Fil: Domitrovic, Hugo Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico; Argentina.
The purpose of the present work was the anatomical, histological and histochemical description of Rhamdia quelen juvenile digestive system. Samples of gut were fixed, dehydrated and included in paraffin and then stained with haematoxylin and eosin. For the identification and differentiation of mucosubstances the preparations were treated with Periodic Acid Schiff, Alcian Blue pH 0,4 and 2,5 and PAS/AB pH 2,5. Anatomical details of the oesophagus were like a short tube with primary and secondary mucous folds. The stratified epithelium is composed of three cellular types: small cells, abundant goblet cells with acid and neutral mucosubstances (MS) and large acid cells. The stomach is J-shaped and its mucosa presents broad and deep folds in relaxing state. Histologically, the stomach shows three different regions: cardiac, fundic and pyloric region. The luminal surface of the epithelium consists of a layer of secretory columnar cells of neutral MS. Tubuloacinar glands were surrounded by connective and muscular smooth fibers bundle. The intestine extends from the stomach until the anus, and four different sections can be distinguished: ascending, descending, convoluta and terminal straight. It was identified a simple columnar epithelium mainly composed by two cellular types: absorptive cell and goblet cell neutral MS secretory. On the basis of the anatomical and histological study carried out, we conclude that R. quelen presents an alimentary canal compatible with species that possess omnivorous nutritious habits.