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Abstract The vertebrate retina contains a large number of different species of neurons that can be distinguished by their morphological properties. Assuming that no place should be without a contribution from the circuitry and function connected to a particular type of neuron, it is likely that dendritic trees of neurons of a particular variety would cover the retina in a regular manner. The contribution to visual processing is expected for both types of neurons, according to those that follow individual neurons across the retina. Here, we have investigated the growth of AII amacrine cells in rat retinas. We discovered that the simulated distributions of cell bodies with size and density similar to real AIIs could not be distinguished from those that were tested experimentally for AIIs in various regions and eccentricities of the retina.
Source link: https://doi.org/10.1017/s0952523822000025
Abstract The mammalian retina's rod-driven, AII amacrine cells have homologous gap junctions with one another, as well as heterologous gap junctions with on-cone bipolar cells. To measure tracer coupling to neighboring AII cells and neighboring cone bipolar cells, we injected single AII amacrine cells with the biotinylated tracer, Neurobiotin, and measured the degree of tracer coupling to neighboring AII cells and neighboring cone bipolar cells. AII cells in well-adapted retinas, resulting in very small networks of about 20 amacrine cells and reaching about 75 percent of the population. Although we observed light-induced changes in the number of tracer-coupled cone bipolar cells, these seemed to be an epiphenomenon of changes in homologous coupling between AII amacrine cells. Hence, our analysis showed no evidence of a light-induced modulation of coupling between AII cells and on-cone bipolar cells, despite the robust change in AII–AII coupling caused by background illumination.
Source link: https://doi.org/10.1017/s0952523800012220
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