Comparative Analysis of the Quantitative Characteristics of the Corticothalamic Projections of Parietal Cortex Fields 5 and 7
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The quantitative distributions of corticothalamic efferent fibers after local lesioning of fields 5 and 7 of the parietal cortex were studied. The largest projections of field 5 and 7 were found to be to the reticular and parafascicular nuclei of the thalamus and the zona incerta. The number of efferent fibers of field 5 terminating in these nuclei was greater than the number of fibers running from field 7. The projections of field 7 to the posterolateral nucleus were greater than those of field 5. The numbers of parietal cortex efferent fibers terminating in the central lateral and ventral anterior nuclei and thalamic pulvinar were insignificant. Thus, the predominant projections of fields 5 and 7 to the reticular and parafascicular nuclei of the thalamus and the zona incerta may be determined by the need for inhibitory control of descending corticoreticular influences.
Key wordsparietal cortex thalamus efferent connections
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- 1.O. S. Adrianov, The Principles of the Organization of Integrative Brain Activity [in Russian], Meditsina, Moscow (1976).Google Scholar
- 2.T. A. Bragina, “Degeneration of afferents in the reticular nucleus of the thalamus in cats after injections of kainic acid into the parietal cortex,” in: Associative Systems of the Brain [in Russian], Nauka, Leningrad (1985).Google Scholar
- 3.N. M. Ipekchyan, “Comparative analysis of the corticotectal projections of the motor and parietal areas of the brain,” in: Structural-Functional, Neurochemical, and Immunochemical Patterns of Brain Asymmetry and Plasticity: Proc. Conf. [in Russian], Ikar, Moscow (2007).Google Scholar
- 4.T. A. Leontovich, Neuronal Organization of Forebrain Subcortical Formations [in Russian], Meditsina, Moscow (1978).Google Scholar
- 6.H. H. Jasper and C. Ajmone-Marsan, A Stereotaxic Atlas of the Diencephalon of the Cat, National Research Council of Canada, Ottawa (1954).Google Scholar