한국인대뇌 선조야(시각피질중추)의 세포구축학적 연구보유

Abstract

This investigation is a study on the cytoarchitectonics. of the crown of the cortex in the striate area of 227 Korean brains(130 brains of the male, aged from newborn to 85, 97 brains of the female, aged from newborn' to 61). The thickness of the total cortex and each cortical' layer, the relatvie neuron density and the relatvie glia density in (100,1.1)3 of each cortical layer and the relative' total neuron and glia densities of the cortex were observed and the results were summarized as follows: 1. The thickness of the cortex in the 0-1 year agegroup was 72.0-77.4% of the adult cortex and increased, rapidly to be 90. 5-91. 8% of the adult cortex in the 2-5 year age group and thereafter increased slowly to' the adult mean thickness in the 11-15 year age group. The mean thickness of the adult cortex was 2. 3mm. The thickness of the cortex increased gradually as the brain weight increased to 1100-1199 gms thereafter it was relatively constant. 2. The highest neuron density in the 0-1 year age group decreased rapidly to the adult mean value in the 2-5 year age group and following this there was no significant changes but after 60 years of age there was found the tendency of slight decrease. The mean neuron density of the adult cortex was 742.1-762.5. As the relationship between the neuron density and the brain weight, it was highest in the 300-499gms stage of brain weight and decreased gradually to the adult mean value in the 1100-1199 gms stage and following this it was relatively constant. 3. The glia density in the 0-1 year age group was highest and it decrased rapidly to the adult mean value in the 2-5 year age group and following this it decreased slowly to the mimimum value in the 11-15year age group and thereafter it increased gradually as the age increased. The mean value of the adult was 853. 2863.6. In the 300-499gms. stage of the brain weight the glia density was highest and decreased gradually to the adult value in the 1100-1199gms. stage and thereafter it was relatively stable. 4. The cortical thickness, neuron density and glia density had neither sexual difference nor left-right difference.