The inner circumference of 47 arteries from 152 human adults (male: 71, female: 81) was measured and the age-related changes were examined. The materials used in this studies were obtained from the autopsy subjects in Tokyo Metropolitan Medical Examiner Office and were examined in the non-fixed situation.
1) The increasing tendency of circumference with age was remarkable for the all parts of the aortae in the male and the all examined arteries except those of abdominal organs in the female. The differences of the circumference between the age of seventy and twenty were statistically significant in these arteries.
2) The A. renalis in the male and A. mesenterica superior and inferior in the female showed a decreasing tendency of circumference with age.
3) The increasing tendency of circumference with age were middle grade for Tr. brachiocephalica, A. carotis communis, A. subclavia, A. axillaris, A. iliaca communis, A. iliaca externa, A. poplitea, A. tibialis anterior and posterior in the male. But the dif-ferences of circumference between the age of seventy and twenty were statistically insignifi-cant in these arteries.
4) In the male A. femoralis, A. carotis interna and externa, and A. brachialis show-ed increasing tendency of circumference with age slightly.
5) In the male A. facialis, A. ulnaris, A. radialis and the arteries in the brain, the age-related changes of the circumference were not seen.
6) From these facts, it can be said that the age-related changes of the circumference of the arteries have very intimate relation with the histological composition of the artery wall and its age-related changes.
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