[Morphological studies on interneuronal relations in the feline motor cortex]

Three types of neuronal joinings in the cat motor cortex are described. The joinings of the 1st type (nests, barrels) consist of some pyramidal cells, apical dendrites of which form the bundles. The consolidation of neurons is achieved by means of dendro-dentritic contacts, pyramidal neuron collaterals and the associative transcortical afferents. The joinings of the 2nd type (distant) are formed with the participation of intracortical connections between the pyramidal and stellate neurons and are placed as concentric formation. The joinings of the 3rd type are formed with the help of projection thalamo-cortical afferents and large horizontal collaterals of basket cells.