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KMID : 0378019730160110081
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New Medical Journal
1973 Volume.16 No. 11 p.81 ~ p.105
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Studies on the Cytoarchitectonics of the Middle Temporal Gyrus (Brodmann´s Area of 21) of the Korean Cerebral Hemisphere
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Abstract
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This investigation is a study on the cytoarchitectonics of the wall of the cerebral sulcus in the middle temporal gyrus (Brodmann´s area of 21) of 149 Korean brains (84 of male, 65 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 (100)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 83% of the adult and it increased very rapidly during 2-5 years and it was 96% of the adult. In the 16-20 year group it was maximum thick and thereafter it decreased gradually. The mean thickness of the adult cortex was 2.19mm. The mean thickness of the cortex incresed rapidly until the 700-899g 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 very rapidly in the 2-5 year group and it decreased slowly until the 11-15 year groups and at this time it is eaqual as the adult mean value. Thereafter it was relatively stable. As the relation between the neuron density and the brain weight, it was highest in 300-500g stage of the brain weight and it decreased rapidly until the brain weight and it decreased rapidly until the brain weight was 500-699g stage and it decreased slowly until the brain weight was 1,100-1,199g 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 was 482-508.
3. The relative glia density was high in the 0-1 year group and it decreased rapidly in the 2-5 year group and was minimum value whlue was lower than the adult mean value, and thereafter it increased gradually as the age increased. The mean value of the relative glia density of the adult was 580-608 which is higher than that of the adult neuron density (482-508). During the 300-499g of the brain-weight the, relative glia-density,was high and it decreased gradually´ to :the mimmum-value (430-490) 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.
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