猫视皮层及外膝体神经元的树突野性质——以偏心度为指标的定量分析

PROPERTIES OF DENDRITIC FIELDS OF THE NEURONES IN THE VISUAL CORTEX AND DORSAL LATERAL GENICULATENUCLEUS OF CAT'S---A QUANTITATIVE ANALYSIS WITH BIAS

用Golgi和Golgi-Cox方法,镀染猫视皮层17、18区、外侧上雪氏回(LS区)和外膝体背核(LGNd)神经元,利用偏心度对其树突野进行定量分析。结果表明,在以上3个区域中,大多数细胞具有伸长的树突野;在17、18区Ⅱ、Ⅲ层,树突野朝向平行于皮层表面的细胞比例明显高于LS区;LGNd内class 3细胞偏心度的平均值大于class l细胞的偏心度平均值;LGNd内多数相邻细胞的树突野朝向相近。

Golgi and Golgi-Cox methods were used to stain the neurones in the II, III layers of 17, 18 areas, lateral suprasylvian area (LS area) of visual cortex and of dorsal lateral geniculate nucleus (LGNd). 298 cells in the II, III layers of 17, 18 areas, 310 cells in the II, III layers of LS area and 168 cells in LGNd were plotted with microscope and camera lucida. Bias was introduced to analyze the properties of dendritic fields of these cells quantitatively. Our results indicated that most of the cells in three areas had elongated and oriented dendritic fields. The proportion of the cells with dendritic fields parallel to the surface of 17, 18 areas was significantly higherthan that of LS area. In LGNd the orientation of dendritic fields of most adjacent cells was similar and the biases of class 3 cells were significantly higher than that of class 1.