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KMID : 0381920090390040291
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Korean Journal of Microscopy
2009 Volume.39 No. 4 p.291 ~ p.299
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Populations of Rod and Cone Photoreceptors in the Hamster Retina
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Yu Song-Hee
Kim Hyun-Jin
Lee Kyoung-Pil
Lee Eun-Shil
Lee Jea-Young
Jeon Chang-Jin
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Abstract
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We report on a quantitative analysis of cone and rod photoreceptors in hamster retina. Cone and rod photoreceptors were counted in retinal whole mounts using differential interference contrast (DIC) optics microscopy after staining of cone photoreceptors were stained with peroxidase-labeled peanut lectin. Middle-to-long-wave-sensitive-(M/L-), and shortwave- sensitive-(S-) cone opsins were visualized by observed using confocal microscope after immunocytochemical procedure. The average cone density was 9,307 cells/mm2, giving a total of cones of 293,060 cone cells per retina. The peak density of cone cells (12,857 cells/mm2) was found 0.3 mm from the optic disk (OD) of the nasal retina. The average rod density was 300,082 cells/mm2, giving a total number of rods of 9,448,150 cells. The peak density of rod cells was found 0.3 mm from the OD of the dorsal retina. Of all photoreceptors studied, the total percentage of rods and cones were 96.99% and cones 3.01%, respectively. The mean ratio of rod and cone was 32.24 : 1. The cone photoreceptors of hamster contained both M/L- and S-cone opsins. The present results suggest that the hamster retina is strongly rod-dominated with some photopic property of vision.
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KEYWORD
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Cones, Density, Photoreceptors, Retinal mosaic, Rods
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