Comparison of aortic lamellar unit structure in birds and mammals

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      The structure of the aortic media at different levels in a number of orders of birds has been examined. In general the avian aorta shows a laminar structure, but differs from the mammalian vessel in the occurrence of broad and distinct smooth muscle cell and connective tissue layers in its proximal part. Part of the vessel has a structure which resembles that of mammals; the aorta distal to the origin of the renal arteries is a mixed musculo-elastic structure. Differences between avian and mammalian aortic physiology and their relevance to structural findings are discussed.


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