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Distribution and size of ganglion cells in the retinae of large Amazon rodents

Published online by Cambridge University Press:  02 June 2009

L. C. L. Silveira
Affiliation:
Department of Physiology, Federal University of Pará, Belém, Brazil
C. W. Picanço-Diniz
Affiliation:
Department of Physiology, Federal University of Pará, Belém, Brazil
E. Oswaldo-Cruz
Affiliation:
Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil

Abstract

The topographical distribution of density and soma size of the retinal ganglion cells were studied in three species of hystricomorph rodents. Flat-mounted retinae were stained by the Nissl method and the ganglion cells counted on a matrix covering the whole retinae. Soma size was determined for samples at different retinal regions. The agouti, a diurnal rodent, shows a well-developed visual streak, reaching a peak density of 6250 ganglion cells/mm2. The total number of ganglion cells ranged from 477, 427–548, 205 in eight retinae. The ganglion-cell-size histogram of the visual streak region exhibits a marked shift towards smaller values when compared to retinal periphery. Upper and lower regions differ in both cell density and cell size. The crepuscular capybara shows a less-developed visual streak with a peak ganglion cell density of 2250/mm2. The shift towards small-sized cells in the visual streak is less marked. Total ganglion cell population is 368,840. In the nocturnal paca, the upper half of the fundus oculi includes a tapetum lucidum. The retina of this species shows the least-developed visual streak of this group, with the lowest peak ganglion cell density reaching 925/mm2. The total ganglion cell number (230,804) is also smaller than in the two other species. Soma-size spectra of this species are characterized by the presence, in the lower hemi-retina, of very large perikarya comparable in size to the cat's alpha ganglion cells.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1989

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