Asymmetries in numerical density of pyramidal neurons in the fifth layer of the human posterior parietal cortex.
2012
Background/Aim. Both superior parietal lobule (SPL) of dorsolateral
hemispheric surface and precuneus (PEC) of medial surface are the parts of
posterior parietal cortex. The aim of this study was to determine the
numerical density (NV) of pyramidal neurons in the layer V of SPL and PEC and
their potential differences. Methods. From 20 (40 hemispheres) formaline
fixed human brains (both sexes; 27- 65 years) tissue blocks from SPL and PEC
from the left and right hemisphere were used. According to their size the
brains were divided into two groups, the group I with the larger left (15
brains) and the group II with the larger right hemisphere (5 brains). Serial
Nissl sections (5 μm) of the left and right SPL and PEC were used for
stereological estimation of NV of the layer V pyramidal neurons. Results. NV
of pyramidal neurons in the layer V in the left SPL of brains with larger
left hemispheres was significantly higher than in the left SPL of brains with
larger right hemisphere. Comparing sides in brains with larger left
hemisphere, the left SPL had higher NV than the right one, and then the left
PEC, and the right SPL had significantly higher NV than the right PEC.
Comparing sides in brains with the larger right hemisphere, the left SPL had
significantly higher NV than left PEC, but the right SPL had significantly
higher NV than left SPL and the right PEC. Conclusion. Generally, there is an
inverse relationship of NV between the medial and lateral areas of the human
posterior parietal cortex. The obtained values were different between the
brains with larger left and right hemispheres, as well as between the SPL and
PEC. In all the comparisons the left SPL had the highest values of NV of
pyramidal neurons in the layer V (4771.80 mm-3), except in brains with the
larger right hemisphere.
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