한국인 대뇌피질 청각 중추(Brodmann 제 41피질분야)의 세포구축학적 연구

Abstract

This investigation is a study on the cytoarchitectonics of the wall of the cerebral sulcus in the transverse temporal gyrus (Brodmanns area of 41) of 142 Korean brains (82 of male. 60 of female) from the newborns to the adults. The thickness of the total cortex and each cortical layer. the relative neuron density and the relative glia density in(1oo)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 0-1 year group was 85% of the adult and it increased very rapidly during 2-5 years and it was 94% of the adult. In the 16-20 year group it was maximum thick and thereatfer it decreased gradually. The mean thickness of the adult cortex was 2.13mm. The mean thickness of the cortex increased rapidly until the 700-899 g stage of the brain weight and increased slowly until the 1.400• 1.499g stage of the brain weight and thereafter it had a tendency of slow decreasing as the brain weight increased. 2. The relative neuron density was highest in the 0-1 year group and it decreased vcry rapidly in the 2-5 year group and it decreased slowly until the 16 -20 year group'; and at this time it is eaqual as the adult mean value. Thereafter it was relatively stable. As the relation between the neuron u.cn:.,ity and the brain weight, it was highest in 300•500g stage of the brain weight and it decreased rapidly until the brain weight wa~ 500-699g stage and it decreased slowly until the brain weight was 1,100 1. 19B9 stage and in this stage it became eaqual as the adult mean value. Thereafter it had a tendency to decrease slowly as the brain weight increased The mean value of the neuron density of the adult 、，va s 594-604. 3. The relative 끽 lia density was high in the 0-1 year group and it decreased rapidly in the 2-5 year group and was minimum value which was lower than the adult mean value. and thereafter it incrc ased gradually as the age increased. The mean value of the relative gl iJ. d~nsity of the adult was 687-711 which is higher than that of the adult neuron density (594-604). During the 300-499g stage of the brain weight the relative glia density was high and it decreased gradmlly to the minimum value (470530) until the 700-899g stage of the brain weight and thereafter it increased gradually as the brain weight increased. 4. The neuron density and glia density had no sexual difference and left-right difference