한국인태아 대뇌중심후퇴(지각피질중추)의 Brodmann 제1피질분야의 발육 및 세포구축학적 연구

Abstract

Authors Studied on the development and cytoarchitec tonics of the cerebral cortex in the Brodmann's area 1 in the post central gyrus of the 183(103 male, 80 female) Korean fetal brains and summarized the results as follows: 1. The thickness of the cerebral cortex was very thin of 161. 3f.l at the fourth month of fetal age and increased very rapidly until the sixth month, relatively rapidly until the seventh month, very slowly until the ninth month and thereafter very rapidly. As the relation to the brain weight, up to 150 gm of brain weight, it increased very rapidly, up to 400 gm of brain weight increased very slowly and thereafter it increased very rapidly again. 2. The differentiation of the lamination of the cerebral cortex began at the end of the sixth fetal month (23 rd week of the gestation period) and during the seventh fetal month the lamination of the cortex had almost occurred but even at the end of the seventh month there was some undifferentiated cortex and so there might be a great individual difference of lamination. 3. The cell density of the cerebral cortex was very high during fifth, sixth and seventh fetal months and thereafter it decreased gradually as the fetal age increased. As the relation of the cell density with the brain weight, up to 150 gm of brain weight the cell density was very high and thereafter it decreased gradually as the brain weight increased. 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.