한국인대뇌전두극부 (제10피질분야) 뇌구벽부 세포구축학적연구

Abstract

This investigation is a study on the cytoarchitectonics of the wall of the cerebral sulcus in the frontal pole areas of 145 Korean brains(85 brains of the male, from the newborn to the age of 85, 64 brains of the female, from the newborn to the age of 61). The thickness of the total cortex and each cortical layer, the relative neuron density and the relative glia density in (IOO,u)' of each cortical layer and the relative total neuron and glia densities of the cortex were observed and the results were summerized as follows: 1. The mean thickness of the cortex in the 0-1 year group was 1.58-1. 67 mm. Which was 81.2% of the adult cortex thickness and increased to 1.801. 90 mm in the 2-5 year group which was 92.2% of the adult and thereafter it increased to the adult mean thickness in the 11-15 year group, and thereafter it was relativery stable. The mean thickness of the adult cortex was 2.01mm. The thickness of the cortex increased gradually as the brain weight increased to 1, 400gms and thereafter it became to decrease. 2. The highest neuron density in the 0-1 year group decreased rapidly to the adult mean value in the 11-15 year group and thereafter it was relatively stable. The mean neuron density of the adult cortex was 670-687. As the relationship between the neuron density and the brain weight, it was highest in 300"'" 500 gms. stage of brain weight and decreased gradually to the adult mean value in the 1,100-1, 199 gms stage and thereafter became stable. 3. The highest glia density was observed in the 0-1 year group but it was lower than the neuron density in the same age group and it decreased very rapidly to the minimum value in the 2-5 year group and following this it gradualy increased. In the 500-699 gIT:Is. stage of the brain weight the mean glia density was highest and decreased very rapidly to the minimun value in the 1,100-1,199 gms stage, thereafter it increased graduall; as the brain weight increased. 4. The neuron density and glia density had no sexual difference and left-right difference.