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How retinal microcircuits scale for ganglion cells of different size.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kier, C. K. Buchsbaum, Gershon Sterling, Peter |
| Copyright Year | 1995 |
| Abstract | Ganglion cell receptive field centers are small in central retina and larger toward periphery. Accompanying this expansion, the distribution of sensitivity across the centers remain Gaussian, but peak sensitivities decline. To identify circuitry that might explain this physiology, we measured the density of bipolar cell synapses on the dendritic membrane of beta (X) and alpha (Y) ganglion cells and the distribution of dendritic membrane across their dendritic fields. Both central and peripheral beta cells receive bipolar cell synapses at a density of approximately 28/100 microns2 of dendritic membrane; central and peripheral alpha cells receive approximately 13/100 microns2. The distribution of dendritic membrane across the dendritic field is dome-like; therefore, the distribution of bipolar cell synapses is also dome-like. As the dendritic field enlarges, total postsynaptic membrane increases with field radius, but only linearly. Consequently, density of postsynaptic membrane in the dendritic field declines, and so does density of synapses within the field. The results suggest a simple model in which the receptive field center's Gaussian profile and peak sensitivity are both set by the density of bipolar cell synapses across the dendritic field. |
| Starting Page | 2525 |
| Ending Page | 2538 |
| Page Count | 14 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://retina.anatomy.upenn.edu/pdfiles/2119.pdf |
| PubMed reference number | 7472518v1 |
| Volume Number | 15 |
| Issue Number | 11 |
| Journal | The Journal of neuroscience : the official journal of the Society for Neuroscience |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Bipolar Disorder Dome Ganglia Ganglion cell Large Normal Statistical Distribution Postsynaptic Membrane Retina Synapses physiological aspects viral capsid secondary envelopment |
| Content Type | Text |
| Resource Type | Article |
