The article summarizes the data concerning morphological development of rabbit brain cortex in postnatal ontogenesis. The processes of development of neuritis of the cortical neurons, formation their synaptic con- nections and myelinization of axons are analyzed. As a result, main regularities of differentiation of the cor- tical neurons in postnatal ontogenesis are revealed. Formation of the layers of brain cortex and afferent- efferent cortical connections is also under consideration. Taking into account that for last decades such stud- ies were not undertaken in rabbits, analysis and generalization of the data are realized based on the modern views on brain cortex in ontogenesis.