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

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.

MORPHOLOGY OF NEURONS AND IDENTIFICATION OF PROJECTING CELLS IN THE HAMSTER DORSAL LATERAL GENICULATE NUCLEUS / 解剖学报

Rapid Golgi preparations of golden hamster dorsal lateral geniculate nucleus (LGd)show three classes of neurons with different morphological characteristics. Class Ⅰ and class Ⅲ cells are distributed throughout the LGd.Class Ⅱ cells are found more common medially at mid-genieulate levels.Class Ⅰ cells are multipolar neurons with large cell body.The smooth primary dendrites branch extensively. Spine-like and small excrescences are found along distal dendrites.Class Ⅱ cells have medium size pear-like cell body.The distal dendrites are usually derived from one primary dentrite.Dense cluster of dentritic protrusions is usually found at branch points of the dendrites.Class Ⅲ cells have the smallest cell body and are paucidendritie but the dendrites have complex protrusions including pearl-like dendritic appendages.Class Ⅰ and class Ⅱ cells possess an axon but most of class Ⅲ cells are not found to have an axon. The connections between the LGd and visual cortex was investigated using the retrograde horseradish peroxidase(HRP)histochemical method.After injection of HRP into the visual cortex,Class Ⅰ and class Ⅱ neurons were labelled but class Ⅲ celts were not suggesting that class Ⅰ and class Ⅱ cells are projecting neurons.Class Ⅲ cells do not seem to project to the visual cortex and are probably local circuit neurons.