한국인 대뇌피질 방선조야(BRODMANN 제18피질분야)의 세포구축학적 연구 보유

Abstract

For the brain scientist, our critical interests are forewarded upon determination on hard of cerebral cortical cytoarchitectonic problems due to characteristic lamination for each cortical wrinkle. The facts are tr1:le not only for manhood but also the most mammals. In connection with the above our attention had been reached on the parastriated area(=Brodmanns cortical area 18) at its crown in connection with the successive changing pattern with the agemg. A sum of 179 none-pathological korean brains were taken from newborns until more than 60-year old specimens, were analyzed faithfully with aided eye. The specimens were prepared previously conditioned manner, were investigated by one-man-work throughout present study. For gaining the ageing trends the specimens were made grouping into 10, for which a short intervals in the younger and a scarece in the olders. 1. The cortical thickness at one-year of age was reached into 77.5% of the mean adult value , was 96.0% at 20-year which was the maximum, and then was seen gradual decrease therafter. The similar pattern concerned with the weight was also observed, however, it had been noted some irregularities in due time, was followed some impression of increment thereafter. 2. The increments of the thickness and weight with the ageing could be carefully summarised under three headings as follows; a) neuroglia: majority in number with hypertrophism and relatively short progenitor cycles accompaning exhautions. b) neuron: minority in number with hypertrophism, relatively stational progenitor cycles accompaning exhautions. c) the other than the above factors(f.e. 、ra s c ul a r ities). 3. The observation upon thickness, weight and cell density of cortex was impressed none of both regional and sexual differences.