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Weltzien, Felix; Percival, Kumiko A.; Martin, Paul R.; Grünert, Ulrike
Journal of comparative neurology, 02/2015, Volume: 523, Issue: 2Journal Article
ABSTRACT About 15 parallel ganglion cell pathways transmit visual signals to the brain, but the interneuron (bipolar and amacrine) populations providing input to ganglion cells remain poorly understood in primate retina. We carried out a quantitative analysis of the inner nuclear layer in the retina of the marmoset (Callithrix jacchus). Vertical Vibratome sections along the horizontal meridian were processed with immunohistochemical markers. Image stacks were taken with a confocal microscope, and densities of cell populations were determined. The density of flat midget bipolar cells fell from 15,746 cells/mm2 at 1 mm (8 deg) to 7,827 cells/mm2 at 3 mm (25 deg). The rod bipolar cell density fell from 8,640 cells/mm2 at 1 mm to 4,278 cells/mm2 at 3 mm, but the ratio of the two bipolar cell types did not change with eccentricity. The amacrine cell density ranged from 30,000 cells/mm2 at 8 deg to less than 15,000 cells/mm2 at 25 deg, but throughout the retina, the ratio of glycinergic to γ‐aminobutyric acid (GABA)ergic to amacrine cells remained relatively constant. The fractions of rod bipolar, cone bipolar, amacrine, Müller, and horizontal cells of all cells in the inner nuclear layer were comparable in central and peripheral retina. Marmosets had lower proportions of midget bipolar and rod bipolar in comparison with macaque. These differences were correlated with differences in rod and cone densities between the two species and did not reflect fundamental differences in the wiring between the two species. J. Comp. Neurol. 523:313–334, 2015. © 2014 Wiley Periodicals, Inc. This study is a quantitative analysis of cell populations in the inner retina of the New World marmoset monkey using immunohistochemical methods. Marmosets have lower proportions of midget bipolar and rod bipolar cells in comparison with macaque, but these differences do not reflect fundamental wiring differences between the two species.
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