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Paul Martin; Structure and electrophysiology of S cone pathways. Journal of Vision 2005;5(12):17. doi: 10.1167/5.12.17.
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© ARVO (1962-2015); The Authors (2016-present)
The retinal circuitry of S cone pathways, and the receptive field properties of subcortical (lateral geniculate nucleus - LGN) neurones with S cone input were measured in marmosets (Callithrix jacchus). Many features of S cone pathways in marmoset retina are comparable with those described for other primate retinas such as macaque monkeys. The S cones make invaginating (“ON”) type contacts with blue-cone bipolar cells, which in turn co-stratify with a small-field bistratified (“blue-on”) ganglion cell type. In contrast to a recent report from macaque retina, however (Klug et al., J Neurosci, 2003), there was no evidence for contact of “OFF” type from midget bipolar cells in marmosets. Recordings from the LGN confirmed that the majority of S-cone input neurones are “blue-on” type; the blue-on cells are predominantly located in the koniocellular division of the LGN. Receptive fields of “blue-off” type were less frequently encountered. The “blue-off” cells were segregated to the koniocellular layers. Receptive field centre diameters of blue-on and blue-off cells were larger (by four - to twenty-fold) than those of parvocellullar cells at equivalent visual field eccentricities. These data suggest that S cone signals contribute to wide-field ganglion cell types in the retina, and travel through the koniocellular layers of the LGN, in marmoset monkeys.
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