According to Franklin (1927) three authors may have first discovered venous valves. Franklin argues for the claim made on behalf of Gian Battista Canano. That claim was supported by Morgagni, Haller and, in this century, by Streeter (1925). Canano was a professor of anatomy at Ferrara; he often met Vesalius and reported to him that he had found valves in the azygous vein, in renal veins and in veins of the sacral region. Canano did not publish his findings himself; the publication was made by Amatus Lusitanus (who also lived in Ferrara) (1551). Amatus, however, erroneously assumed that the valves served the purpose of forming an obstacle to the bloodflow from the azygous vein into the caval vein. He also quoted Canano in that respect. The error made Amatus the object of much ridicule so that (according to Franklin, 1927) venous valve research suffered a setback of several years.
KeywordsRenal Vein Caval Vein Potential Discoverer Venous Valve Sacral Region
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