한국인 대뇌운동전야 (제6피질분야)의 세포구축학적연구 보유

Abstract

The cytoarchitectures of the cerebral cortex in the premotor area (Brodmann's area 6) of 147 Korean brains (male 79, female 68) have been studied. The thickness, the relative neuron density and the relative g lia density were analysed by the age and the bain weight. 1. The mean thickness of the cortex at the 0-1 year age group was 81 per cent of the adult cortex and increased rapidly to the average value of the adult at the age group of 6-10 years. The highest value was found at the age group of 11-15 years and was corresponded to that of the 1100-1199gm of the brain weight. The mean thickness of the adult cortex were 3. 11 mm in male and 3. 12 mm in female. 2. The highest neuron density in the 0-1 year group decreased rapidly to the adult mean value a~ the 2-5 year group and thereafter it had no significant changes. It decreased to the average values of the adult when the brain weight was 1100-1199 gm and thereafter it was relatively stable. 3. The relative glia density was very high in the 0-1 year age group and decreased rapidly to the average value of the adult at the age group of 2-5 years. It was minimum at the age group of 6-10 years and thereafter it increased corresponding with increasing of age. At the 300-500 gm stage of the brain weight the mean glia density was highest and decreased to the minimum value at the 1100-1199 gm and thereafter it had no distinct changes. 4. The neuron density and glia density had neither sexual difference nor left-right difference.