How is the visual. Information channel formed in the avian retino-tectal system?

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Six groups of chick RGCs, which were reported in our previous paper, convey characteristic elementary information of vision to certain primary visual centers through their channels that are formed by each RGC groups. In present study, we investigated the formation of the visual information channels. On E8 (embryonic day 8), all RGCs showed the narrow dendritic field by poor branching of dendrites. On Ell, first two groups, Group Ic-like cells with narrow dendritic field and Group lls/llc-like cells with middle-sized dendritic field, were discriminated. On E14, other two groups, Group Ills-like cells and Group Ivc-like cells, both of which showed wide dendritic fields, were appeared. All six groups were observed on E17. Laminar patterns by dendritic arborization in the inner plexiform layer (IPL) were various by ganglion cell types. Group l-like cells and Group Ills-like cells extended their dendrites into two laminas and a single lamina of the IPL, respectively. The dendrites of Group l-like and Group IV-like cells ramified into more than two laminas. More precise analysis on this issue is now in progress. We could considerthat it is important and advantageous forall animals, which use the light information in their life, to divide it into some elementary channels.