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

我们在之前的文章中报道了6组小鸡RGC，它们通过各自的RGC群形成的通道将视觉的特征基本信息传递给特定的初级视觉中心。在本研究中，我们研究了视觉信息通道的形成。在E8（胚胎第8天），所有rgc均表现出狭窄的树突区，树突分支不良。在Ell上，区分出具有狭窄树突场的ic类细胞组和具有中等树突场的ll / lc类细胞组。在E14上，出现了另外两组细胞，即ill -like细胞组和Ivc-like细胞组，它们都表现出较宽的树突状区。6组均在E17上观察。内丛状层树突形成的层流模式因神经节细胞类型而异。l-like组细胞和ill -like组细胞的树突分别延伸为IPL的两个层和一个层。l-like组和IV-like组细胞的树突分叉成两个以上的层。目前正在对这个问题进行更精确的分析。我们可以认为，把光信息分成几个基本的通道，对所有在生活中使用光信息的动物都是重要的和有利的。

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.