ABSTRACT
Foram estudados corpúsculos de Herbst da mucosa palatina de avestruz em nível de microscopia de luz. Os corpúsculos compõem-se de uma cápsula externa, cápsula interna e axônio central. A cápsula externa apresentou numerosas lamelas, enquanto que a cápsula interna mostrou estrutura de folhas compactas. Os corpúsculos apresentaram formato ovalado ou circular e circundado por espessos feixes de fibras colágenas. Cada lamela estava composta de uma densa rede de fibras espessas. Os axônios terminais estavam situados ao longo do eixo, terminando em um bulbo terminal. As fibras da cápsula externa, coradas por Picrosirius e examinadas no microscópio óptico sob luz polarizada, revelou a presença de fibras colágenas do tipo I em verde e na região periférica observou-se grande quantidade de fibras colágenas do tipo III. Os corpúsculos apresentaram-se envoltos por células planas e envoltos por fibras colágenas.
Herbst corpuscles of the palatine mucosa of ostrich were studied by light microscopy. The corpuscles are composed of an outer core, inner core and central nerve terminal. The outer core presents numerous lamellae, while the inner core shows compact structure of cytoplasm sheets. The corpuscles are elongate or oval in shape and are surrounded by bundles of collagen fibers. Each lamella is composed of a dense network of thick fibrils. The terminal axons are located along the axis and form a bulb terminal. The fibers of external core stained by Picrosirius and examined by polarized light microscopy revealed to be green in color like type I collagen fibers, and at the periphery is a large amount of collagen type III. The corpuscles are surrounded by flat cells and dense collagen fibers at the periphery.
Subject(s)
Animals , Mechanoreceptors/anatomy & histology , Microscopy, Polarization/methods , Palate/anatomy & histology , StruthioniformesABSTRACT
Antennal sensilla patterns were used to analyze population variation of domestic Rhodnius prolixus from six departments and states representing three biogeographical regions of Colombia and Venezuela. Discriminant analysis of the patterns of mechanoreceptors and of three types of chemoreceptors on the pedicel and flagellar segments showed clear differentiation between R. prolixus populations east and west of the Andean Cordillera. The distribution of thick and thin-walled trichoids on the second flagellar segment also showed correlation with latitude, but this was not seen in the patterns of other sensilla. The results of the sensilla patterns appear to be reflecting biogeographic features or population isolation rather than characters associated with different habitats and lend support to the idea that domestic R. prolixus originated in the eastern region of the Andes.