Vesalius grew up to become the most influential anatomist of the Renaissance, personally dissecting human cadavers rather than relying on ancient texts. His 1543 masterwork 'De Humani Corporis Fabrica' corrected hundreds of errors inherited from Galen and established observation as the foundation of medical science.
Born into a family of court physicians and pharmacists, Vesalius showed an early obsession with the body that bordered on the macabre. As a student he reportedly stole corpses from Paris gallows at night, dodging dogs and rival scavengers, to study skeletons and musculature firsthand.
That hands-on approach became his signature and his scandal. Medical teaching in the 1530s still leaned almost entirely on Galen, a Greek physician who had dissected apes and pigs, not humans, and whose conclusions had calcified into unquestioned doctrine. Vesalius's insistence on cutting open actual human bodies, and drawing what he actually saw, exposed hundreds of Galenic errors.
The result, 'De Humani Corporis Fabrica,' published when he was just 28, paired precise anatomical description with woodcuts so beautiful they doubled as art. He gave up much of his research shortly after, reportedly burning many of his papers, and became a court physician instead. But the book he left behind reoriented medicine toward direct observation for good.
Key people: Andreas Vesalius