Neuroscience and Behavioral Physiology

, Volume 41, Issue 1, pp 10–12 | Cite as

Comparative Analysis of the Quantitative Characteristics of the Corticothalamic Projections of Parietal Cortex Fields 5 and 7

  • N. M. Ipekchyan

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 words

parietal cortex thalamus efferent connections 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    O. S. Adrianov, The Principles of the Organization of Integrative Brain Activity [in Russian], Meditsina, Moscow (1976).Google Scholar
  2. 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. 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. 4.
    T. A. Leontovich, Neuronal Organization of Forebrain Subcortical Formations [in Russian], Meditsina, Moscow (1978).Google Scholar
  5. 5.
    C. R. Houser, J. E. Vaughn, R. P. Barber, and E. Roberts, “GABA neurons are the major cell type of nucleus reticularis thalami,” Brain Res., 200, No. 2, 341–354 (1980).CrossRefPubMedGoogle Scholar
  6. 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
  7. 7.
    E. D. Jones and T. P. S. Powell, “An analysis of the posterior group of thalamic nuclei on the basis of its afferents,” J. Comp. Neurol., 143, No. 2, 185–216 (1971).CrossRefPubMedGoogle Scholar
  8. 8.
    G. Rizzolatti and M. Matelly, “The organization of the cortical motor system: new concepts,” EEG Clin. Neurophysiol., 106, 238–296 (1998).CrossRefGoogle Scholar
  9. 9.
    R. T. Robertson and T. J. Cunningham, “Organization of the corticothalamic projections from parietal cortex,” J. Comp. Neurol., 199, No. 4, 569–585 (1981).CrossRefPubMedGoogle Scholar
  10. 10.
    R. T. Robertson and E. Rinvik, “The corticothalamic projections from parietal regions of the cerebral cortex. Experimental degeneration studies in the cat,” Brain Res., 51, 61–79 (1973).CrossRefPubMedGoogle Scholar

Copyright information

© Springer Science+Business Media, Inc. 2011

Authors and Affiliations

  1. 1.Autonomic Nervous System Physiology Laboratory (Director: Doctor of Biological Sciences L. B. Nersesyan)L. A. Orbeli Institute of Physiology, National Academy of Sciences of the Republic of ArmeniaErevanArmenia

Personalised recommendations