Estudo ultra-estrutural do esôfago de Trichogenes longipinnis (Britski & Ortega) (Pisces, Siluriformes, Trichomicteridae)

Abstract

ABSfRACf. ULTRASfRUCfURAL sruDY OF THE OESOPHAGOUS O F TRICHOGENES LONGIPINNIS (BRITSKI & ORTEGA) (PISCES, SILURIFORMES, TRICHOMICTERIDAE). Trichogenes longipinnls (Britski & Ortega, 1983) is a leather fish restricted to the rivers on the shore in the southeast of Brazil. ln this work, the oesophagous structure is being showed. The oesophagous appears itself short, dorsaliy inciinated toward pericardium and ventraliy covered by iiver lobe. By electron microscopy we can observe a mucosa layer formed by stratified squamous epithelium and lamina propria with slralum compactum. The epithelium is composed by three types of celis: superficial squamous celis; mucous celis, similar to the globet celis and polyhedric celis. The stratification of this epithelium provides a complete basal layer of proliferation polyhedric cells. The celis in the intermediate region of the epithelium are also polyhedric. These celis are juS! bellow the superficial squamous cells and packed among mucous celis.