[Associative and callosal stellate neurons in the parietal area of the cat cerebral cortex]

After horseradish peroxidase has been injected into the cat parietal area, in the ipsilateral visual and limbic cortical areas, as well as in the contralateral parietal area long axonal associative and callosal stellate neural cells are revealed. Their bodies are round or oval, 18-25 mcm in size. In the associative neurons--they are always labelled better than the callosal ones--radial arrangement with nearly an equal distance between each other is specific for the dendrites, while in the callosal neurons they are grouped polarly. The associative stellate cells are situated in the layer II and in the upper part of the layer III of the visual and limbic cortex at the side where the enzyme is injected, and the callosal ones--in the lower part of the layer III and in the layer IV of the homotypical portions of the contralateral parietal cortex area. The main difference between the neurons detected is a various length of the axon. In the cortico-cortical ipsilateral neurons the axons are nearly 3--4 times shorter than those in the commissural stellate cells. Hence, the neuronal category described is present not only in the projection cortical zones, as it has been stated previously, but in the associative areas, as well.