I. Biography
Andreas Vesalius was born on Dec. 31, 1514, in Brussels, the son of Andries van Wesele and his wife, Isabel Crabbe. Vesalius's paternal ancestors, who hailed from the German town of Wesel, came to Brussels in the early 15th century and became prominent as physicians and pharmacists. His father served as pharmacist to Margaret of Austria and later to Emperor Charles V. His great-grandfather, Johannes Wesalia, was the head of the medical school at the University of Louvain, where Vesalius started his medical studies in 1530. He matriculated as Andres van Wesel de Bruxella.
In 1533 Vesalius transferred to the medical school of the University of Paris. One of his two teachers of anatomy there was Johann Guenther von Andernach, a personable man but a poor anatomist. The other was Jacobus Sylvius, who departed from tradition by giving some role to dissecting in anatomical instructions. Both teachers gave in their own ways a telling testimony of their student's anatomical expertise. Guenther, in a book published in 1536, recorded in glowing terms Vesalius's discovery of the spermatic vessels. Sylvius, however, decried violently Vesalius's daring claim that Galen, the great authority in physiology since classical times, wrote on the inner organs of the body without ever seeing them.
Because of the outbreak of war between France and Charles V, Vesalius, a citizen of the Low Countries, which were a part of the Holy Roman Empire, had to leave Paris in 1536. He returned to Louvain, where, at the recommendation of Guenther, Vesalius, still a student, was permitted to conduct public dissections. He also published a Paraphrase of the Ninth Book of Rhazes (Rhazes, also known as al-Rasi, was a Moslem physician of the early 10th century), in which he made a considerable effort to substitute Latin terms for the still heavily Arabic medical terminology.
But Vesalius soon became embroiled in disputes with faculty members, evidencing both his