Comparative Studies on the Quantities of Tissue Elements of the Walls of Arteries and Veins of Rabbit and Goat

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Various arteries and veins of rabbit and goat were stained with the azan method and with WEIGERT's resorcin fuchsin. The various amounts of elastic, muscle and collagenous fibers of the intima media and abventitia of the walls of blood-vessels were numerically described and comparatively investigated.The amount of each tissue component in arteries as well as their mutual relationships change according to the distance from the heart. Namely, the elastic fibers in the intima and media are in abundance near the heart and decrease gradually in the peripheral arteries. On the other hand they are contained richly in the adventitia of the peripheral ones.The muscle fibers are seldom found in the intima except near the heart. The muscle of the media is found richly in distant arteries. In the adventitia they appear irregularly.The collagenous fibers in the three layers of a teries are, in comparison with the thickness of the wall, richer in arteries near the heart.Comparing several arteries it was found that the intima of arteries near the heart is richest in elastic fibers, but is relatively poor in muscle fibers. Peripheral arteries are rich in collagenous fibers and elastic fibers become fewer. In the media the elastic fibers are the most abundant and the muscle fibers are the least so near the heart, but further to the periphery the muscle fibers increase gradually and finally dominates over the other fibers. At the same time the collagenous fibers become intermediately numerous and the elastic fibers become much less in amount.In the adventitia of arteries near the heart the collagenous fibers are as a rule the most abundant and the muscle fibers are the least. In distant situated arteies the elastic fibers increase in number.The quantities of the tissue components of veins in the three layers also change according to the distance from the heart. The elastic fibers of the layers become generally fewer in more peripherablly situated veins.The relation of the three tissue components in each layer of the veins change at different rates in different veins, so that there are no regular changes according to the distance from the heart.