한국인 대뇌의 중신전회 (피질운동장추)의 세포구축학적 연구

Abstract

This investigation is a study on the cytoarchitectonics of the crown of the cortex in the precentral gyrus of 209 Korean brain (115 brains of the male, from the newforn to the age of 85, 94 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 (100,u)3 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-lyear group was 2.597-2.629 mm which was 81% of the adult cortex thickness and increased very rapidly to 2. 96 2-3. 04Rmm in the 2-5year group which was 94% of the adult, and thereafter it increased to the adult mean thickness in the 11-15 year group. After 61 years of age it became to decrease. The mean thickness of the adult cortex was about 3. 2 mm. The thickness of the cortex increased gradually as the frain weight increased to 1,400 gms and thereafter it became to decrease. 2. The highest neuron density in the 0-1 year group decreased rapidly to the adul tmean value in the 11-15 year group and thereafter it was relatively stable. The mean neuron density of the adult cortex was 358.0385.4. As the relationship between the neuron density and the brain weight, it was highest in 300-500gms. stage of brain weight and decreased gradually to the adult mean value in the 1,200-1,300 gms. stage and thereafter it was stable. 3. The glia density in the 0-1 year group was highest but it was lower than the neuron desity in the same age group and it decreased very rapidly to the adult mean value in the 2-5 year group, following this it gradually increased. The mean value of the adult was 495.1-523.4. In the 500-699 gms, stage of the brain weight the mean glia density was highest and decreased very rapidly to the minimum value in the 900-1, 099 grns, stage and thereafter it increased gradually as the brain weight increased. 4. The nuron density and glia density had no sexual difference.