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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

Asymmetries in numerical density of pyramidal neurons in the fifth layer of the human posterior parietal cortex