Quantitative characteristics of myeloarchitectonics of the fibrillar radial system of the infraparietal area of the human brain
Kravchenko, G.S.
Arkhiv Anatomii Gistologii i Embriologii 79(10): 30-36
1980
ISSN/ISBN: 0004-1947 PMID: 7004404 Document Number: 165402
A complex and in each layer investigation of cyto- and myeloarchitectonics of the fibrillar radial system in fields 40, 39 of the inferioparietal area has been performed in histological preparations of the left and right hemispheres of one mature human brain. In "cellular" preparations the width of cytoarchitectonic layers has been measured, in "fibrillar" preparations in layers 4, 5, 6 the external diameter of the fibrillar fasciculi, that of fibres in the fasciculi have been measured, the number of fasciculi, as well as the number of fibres in the fasciculi have been counted. Each left and right cytoarchtectonic layer has its own degree in changeability of the width. Fibrillar radial system is characterized by a rather high degree of changeability. As to the distribution of the fibrillar radial fasciculi in each layer and that of fibres according to their caliber in the left and right hemispheres, it does not obey any normal law, has rather considerable coefficients of the right-sided asymmetry and, on the whole, great positive meanings of excess. Reliability of interhemispheric differences has been stated according to the caliber of the fasciculi and fibres, as well as the difference between the layers of every hemisphere. The data obtained seem to demonstrate certain differences existing in the rate of impulse transmission for each layer and between the hemispheres.