Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/3385
metadata.dc.type: Artigo de Periódico
Issue Date: Jun-2005
metadata.dc.creator: GOMES, Francinaldo Lobato
SILVEIRA, Luiz Carlos de Lima
SAITO, Cézar Akiyoshi
YAMADA, Elizabeth Sumi
Title: Density, proportion, and dendritic coverage of retinal ganglion cells of the common marmoset (Callithrix jacchus jacchus)
Citation: GOMES, F. L. et al. Density, proportion, and dendritic coverage of retinal ganglion cells of the common marmoset (Callithrix jacchus jacchus). Brazilian Journal of Medical and Biological Research, Ribeirão Preto, v. 38, n. 6, p. 915-924, jun. 2005. Disponível em: <http://www.scielo.br/pdf/bjmbr/v38n6/5633.pdf>. Acesso em: 18 jan. 2013. <http://dx.doi.org/10.1590/S0100-879X2005000600014>.
Abstract: We performed a quantitative analysis of M and P cell mosaics of the common-marmoset retina. Ganglion cells were labeled retrogradely from optic nerve deposits of Biocytin. The labeling was visualized using horseradish peroxidase (HRP) histochemistry and 3-3'diaminobenzidine as chromogen. M and P cells were morphologically similar to those found in Old- and New-World primates. Measurements were performed on well-stained cells from 4 retinas of different animals. We analyzed separate mosaics for inner and outer M and P cells at increasing distances from the fovea (2.5-9 mm of eccentricity) to estimate cell density, proportion, and dendritic coverage. M cell density decreased towards the retinal periphery in all quadrants. M cell density was higher in the nasal quadrant than in other retinal regions at similar eccentricities, reaching about 740 cells/mm2 at 2.5 mm of temporal eccentricity, and representing 8-14% of all ganglion cells. P cell density increased from peripheral to more central regions, reaching about 5540 cells/mm2 at 2.5 mm of temporal eccentricity. P cells represented a smaller proportion of all ganglion cells in the nasal quadrant than in other quadrants, and their numbers increased towards central retinal regions. The M cell coverage factor ranged from 5 to 12 and the P cell coverage factor ranged from 1 to 3 in the nasal quadrant and from 5 to 12 in the other quadrants. These results show that central and peripheral retinal regions differ in terms of cell class proportions and dendritic coverage, and their properties do not result from simply scaling down cell density. Therefore, differences in functional properties between central and peripheral vision should take these distinct regional retinal characteristics into account.
Keywords: Sistema magnocelular
Sistema parvocelular
Sistema visual
Descolamento da retina
ISSN: 1414-431X
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - ICB

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