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Distribution and coverage of A- and B-type horizontal cells stained with Neurobiotin in the rabbit retina

Published online by Cambridge University Press:  02 June 2009

Stephen L. Mills
Affiliation:
Sensory Science Center, Graduate School of Biomedical Sciences, University of Texas at Houston-Health Science Center, Houston
Stephen C. Massey
Affiliation:
Sensory Science Center, Graduate School of Biomedical Sciences, University of Texas at Houston-Health Science Center, Houston

Abstract

Both A- and B-type horizontal cells in the rabbit retina were labeled by brief in vitro incubations of the isolated retina in the blue fluorescent dye 4,6–diamino-2–phenylindole. Intracellular injection of Lucifer Yellow into the somata revealed the morphology of the individual cells. Dye-coupling with Lucifer Yellow was seen only between A-type horizontal cells. By contrast, injection of the tracer Neurobiotin showed dye-coupling between both A- and B-type horizontal cells. There also appeared to be coupling between the axon terminals of B-type horizontal cells.

The extensive dye-coupling seen following injection of Neurobiotin into a single horizontal cell soma can be used to obtain population counts of each cell type. Staining of large numbers of each cell type across the retina showed that each type increased in number and declined in dendritic diameter as the visual streak was approached, such that relatively constant coverage across the retina was maintained. In the visual streak, A-type horizontal cells numbered 555 cells/mm2 and averaged 120 μm in diameter, compared to 1375 cells/mm2 and 100 μm for B-type horizontal cells. In the periphery, the A- and B-types numbered 250 cells/mm2 and 400 cells/mm2, respectively. The average diameters of the dendritic trees at these locations were 225 μm for the A-type and 175 μm for the B-type. Coverage across the retina averaged almost six for A-type horizontal cells and 8–10 for the B-type. A-type horizontal cells in the visual streak whose elliptical dendritic fields were shown by Bloomfield (1992) to correlate physiologically with orientation bias were shown to be dye-coupled to cells with symmetrical dendritic fields.

Type
Research Articles
Copyright
Copyright © Cambridge University Press 1994

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