THE EFFECT OF AGE ON THE ELASTICITY OF THE MAJOR BRAIN ARTERIES.
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A description is given of the distribution of the longitudinal mucosal corrugations in the human tracheo-bronchial tree. It has been shown that they are made up of elastic tissue in a collagen matrix, and that the elastic fibres continue into the smallest bronchioles beyond where the corrugations are no longer visible. An examination has also been made of the tracheo-bronchial trees of the hen, rat, raccoon, pig, sheep, llama and tiger. Corrugations are present in all these animals, except the hen and the raccoon, and they have been compared and contrasted with the condition in Man. The functional significance of these corrugations remains unknown, but, they could be important in equalizing tension in the tracheo-bronchial tree during inspiration, as well as in providing elastic recoil during expiration.
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The authors discuss methods and devices for determination of the compressive properties of elastic products in prophylaxis and treatment of the disease of lower extremity veins. The majority of the discussed methods is tedious, and the devices used are characteristic of high measurement error and frequently can be used in laboratories only. The authors designed a portable device for the measurement of the pressure exerted on every part of the body by the elastic products. This device can be applied both in standard and in clinical conditions. It is simple and easy to handle, and the results obtained reflect the real pressure exerted by the elastic products on extremities. Moreover, the authors presented a new method of measurement of elastic products pressure on human extremity.