[Speed of and sex differences in the aging process in human tissue]

By means of the point counting method we determined the decrease of musculature and the increase of the connective tissue in the ageing ciliary muscle of the human eye and in the tunica muscularis of the small intestine as well as the increase of fatty tissue in human parathyroid glands during life. The paper describes the changes found by adaptation of exponential functions to the series of marks and reveals the implications resulting concerning the speed of the histological biomorphosis in the individual part of life as well as on their theoretical final stage. The speed of ageing permanently decreases from birth to death and aims at zero. There are only small differences between the observed parts of muscles and connective tissue, respectively, of very old people and the calculated values for "immensely" old people. Human parathyroid glands age markedly different to sex. The sexual divergence of the biomorphosis may be among others be morphometrically demonstrated on the basis of the increase of the interstitial fatty tissue.