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While Vesalius challenged Galen's anatomy, he retained much of his physiology. According to Galen, nourishment was taken by the portal vein from the digestive system in the form of chyle to the liver, where it was converted into blood. De Humani Corporis Fabrica (On the Fabric of the Human Body) is one of the most influential works in the history of Western medicine. It was conceived and written by 28 year old Andreas Vesalius (December 31, 1514 - October 15, 1564) a Belgian anatomist and physician. He was a professor at the University of Padua and later became Imperial physician at the court of Emperor Charles V. He was both a gifted dissector and a learned scholar whose great contribution was to apply to anatomy the critical methods developed by the Renaissance humanist scholars. In 1564 he went on a pilgrimage to the Holy Land. When he reached Jerusalem, he received a message requesting he again accept the Paduan professorship, which had become vacant. The ship he sailed on was wrecked on the island of Zakynthos. Here he soon died in such debt that a benefactor paid for his funeral. He was 49 years old.
