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Distribution of rods and cones in the red-eared turtle retina (Trachemys scripta elegans).
Grötzner, Sonia Regina; de Farias Rocha, Fernando Allan; Corredor, Vitor Henrique; Liber, André Maurício Passos; Hamassaki, Dânia Emi; Bonci, Daniela Maria Oliveira; Ventura, Dora Fix.
Afiliação
  • Grötzner SR; Departament of Cell Biology, Federal University of Paraná, Curitiba, Paraná, Brazil.
  • de Farias Rocha FA; Institute of Biological Sciences, Federal University of Pará, Belém, Pará, Brazil.
  • Corredor VH; Nucleus of Theory and Research of Behavior, Federal University of Pará, Belém, Pará, Brazil.
  • Liber AMP; Departament of Experimental Psychology, University of São Paulo, São Paulo, São Paulo, Brazil.
  • Hamassaki DE; Departament of Experimental Psychology, University of São Paulo, São Paulo, São Paulo, Brazil.
  • Bonci DMO; Departament of Cell and Developmental Biology, University of São Paulo, São Paulo, São Paulo, Brazil.
  • Ventura DF; Departament of Experimental Psychology, University of São Paulo, São Paulo, São Paulo, Brazil.
J Comp Neurol ; 528(9): 1548-1560, 2020 06 15.
Article em En | MEDLINE | ID: mdl-31785154
We have identified the photoreceptors of Trachemys scripta elegans, an intensely studied species that is a model for color vision work. To recognize and count the different photoreceptor types, we labeled them with a combination of morphological and immunohistochemistry markers. The counts for the determination of the density of each photoreceptor type were made in wholemount retinas. The percentages found for each cone type were 29, 23, 21, 12, and 6%, respectively, for L (both types), double, M, S, and ultraviolet cones. The cones were found to be organized horizontally in a visual streak, a linear region with a higher density of photoreceptors that ends temporally in the periphery and more centrally in the nasal side. This region of high density of photoreceptors was not symmetrical along its extension; there was a region with conspicuous central density peaks in the temporal area, suggestive of an area centralis. We also observed a dorsoventral asymmetry in photoreceptor density, with greater density in the ventral region. This asymmetry was observed in cones and rods, but it was more pronounced in the rods. Our results corroborate and extend the findings of previous work in the literature describing the retinal photoreceptors of T. s. elegans and their spatial organization. The higher cone density within the visual streak reflects increased spatial resolution and its existence suggests the possibility of binocular vision. It is remarkable that within this region the entire potential for color vision is also present.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Tartarugas / Células Fotorreceptoras Retinianas Bastonetes / Células Fotorreceptoras Retinianas Cones Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: J Comp Neurol Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Tartarugas / Células Fotorreceptoras Retinianas Bastonetes / Células Fotorreceptoras Retinianas Cones Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: J Comp Neurol Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos