The midget pathways of the primate retina
The midget pathways of the primate retina
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DOI：
10.1023/a:1022469002511
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发表时间：
2003-01-01
影响因子：
1.4
通讯作者：
Marshak, D
中科院分区：
文献类型：
--
作者：
Kolb, H;Marshak, D
本文用电镜观察了人和猴视网膜中央凹斜面、视网膜旁、近周边和远周边的小神经节细胞。五个人类中央凹神经节细胞重建，并发现共享输入从七个侏儒双极细胞。偏心神经节细胞与其小双极细胞呈一对一的关系。但ON中心细胞接受来自两到三个侏儒双极细胞的输入，其中一个在指向侏儒神经节细胞树突的带状突触数量方面占主导地位。在人类的旁丘脑中，每个侏儒神经节细胞只接受来自一个侏儒双极细胞的输入（先前发表的，Kolb和DeKorver，1991）。在4毫米的偏心率，近外周ON侏儒神经节细胞收到输入从三个侏儒双极细胞，从而从三个锥。在远周边视网膜（12毫米）上的侏儒神经节细胞接收来自三到四个侏儒双极细胞的输入。周围的侏儒双极细胞可能接触三个锥细胞：因此，9到12个锥细胞之间可能有输入到这样的侏儒神经节细胞。树突状领域的大小和增加收敛锥的侏儒神经节细胞与偏心距中央凹的关系进行了讨论，在颜色处理和分辨率。
Midget ganglion cells in the foveal slope, parafovea, near periphery and far periphery of human and monkey retinas have been studied by electron microscopy (EM). Five human foveal ganglion cells were reconstructed and found to share input from seven midget bipolar cells. The OFF center ganglion cells were in a one to one relationship with their midget bipolar cells. But the ON center cells received input from two to three midget bipolar cells, of which one was dominant in terms of numbers of ribbon synapses directed at the midget ganglion cell dendrites. In the human parafovea every midget ganglion cell received input from only one midget bipolar cell (previously published, Kolb and DeKorver, 1991). At 4 mm of eccentricity, the near peripheral ON midget ganglion cell received input from three midget bipolar cells and thus from three cones. In far peripheral retina (12 mm) the ON midget ganglion cell received input from three to four midget bipolar cells. The peripheral midget bipolar cells probably contacted three cones each: therefore between nine and 12 cones could have input to such midget ganglion cell. The relationship of the increasing dendritic field size and increasing convergence of cones to the midget ganglion cells with eccentricity from the fovea is discussed in terms of color processing and resolution.