The effect of the cingulate cortex on the development of the frontal lobe in the human.

In the study, measurements of cortical structures of the medial surfaces of cerebral hemispheres of adults were taken. Its aim was to test whether the examined values were correlated with one another, and if so, then to what degree. Studies were conducted on 100 brains of adult people. It was assumed that the span of the corpus callosum (the genual retrosplenial length) of the left and the right hemisphere of the given brain was constant. The results of measurements and their statistical analysis prove that in both hemispheres the parameters concerning the cingulate gyrus, mainly of its paragenual width, are situated within the limits of significance. The mean values of the length of this gyrus were bigger on the left hemisphere. Differences in size of the hemispheres appeared to be statistically insignificant. The mean arithmetic values of the fronto-occipital distance of the hemispheres were greater for the right hemisphere. The results suggest that certain changes in the values of the frontal lobes depend on changes in values concerning the cingulate gyrus. This fact may confirm suggestions of certain authors that limbic structures of man, encompassing also the cortex of the cingulate gyrus, are not retarded and that their effect on the development of the frontal lobes may be as considerable as the one of the gyri.