태아 대뇌각회부(Brodmann 제39피질분야) 피질의 발육 및 세포구축학적 연구

Abstract

Authors studied on the development and cytoarchitectonics of the cerebral cortex in the angular gyrus (Brodmanns area of 39) from 118 (62 males and 56 females) Korean fetal normal brains. and summerized the results as follows: 1. The thickness of the cerbral cortex was 663μ of male. 613μ of female at the fifth month of fetal age and increased rapidly until the seventh month, and up to the ninth month increased slowly and thereafter increased rapidly again. As the relation to the brain weight. up to 101~150gm stage of the brain weight it increased rapidly. up to 400gm of the brain weight increased slowly and thereafter it increased rapidly again. 2. The differentation of the lamination of the cerebral cortex began at the beginn of the sixth fetal month (22nd week of the gestation period) and was finished during the sixth fetal month. 3. The cell density of the cerebral cortex was very high up to the seventh fetal month and thereatfer it decreased gradually as the fetal age increased. As the relation of the cell density with the brain weight. up to 150gm of the brain weight the cell density was very high and thereafter it decreased gradually as the brain weight increased. 4. The nerve cells of the fetal cortex might be increased very rapidly up to the seventh month of fetal age and thereafter the number of the nerve cells of the cortex might be stabilized.