Reading passage
For more than a thousand years, European medicine rested on the writings of a single man. Galen, a Greek physician who treated gladiators and emperors in second-century Rome, produced hundreds of texts describing the body's structure, and his authority became so absolute that questioning him bordered on heresy. There was, however, a fundamental flaw: Roman law largely forbade the dissection of human corpses, so Galen inferred human anatomy from dissecting animals, chiefly Barbary apes and pigs. His descriptions of the human liver, the jawbone and the muscles of the spine therefore contained errors that went uncorrected for fourteen centuries, faithfully copied from one generation of manuscripts to the next.
The revival of direct observation began in the universities of Renaissance Italy, where public dissections became formal, even theatrical, events. At Padua and Bologna, professors read aloud from Galen while assistants opened a corpse on a marble table and pointed to the structures being described. The arrangement was revealing in itself: the professor, elevated on a podium, rarely touched the body, and discrepancies between the ancient text and the actual organs were usually explained away as changes in the human race since Roman times.
The man who shattered this arrangement was Andreas Vesalius, appointed professor of surgery at Padua in 1537 at the age of twenty-three. Vesalius scandalised colleagues by descending from the podium and dissecting with his own hands. In 1543 he published On the Fabric of the Human Body, a seven-volume work illustrated with extraordinary woodcuts, almost certainly produced in the workshop of the artist Titian. The book corrected more than two hundred of Galen's errors, demonstrating, for instance, that the human jaw is a single bone and that the heart's septum has no invisible pores. Vesalius paid a price for his independence: mocked by Galen's defenders and denied advancement, he resigned his chair in frustration a few years later.
Anatomy could progress only as fast as the supply of bodies allowed. Dissection required corpses, and the law restricted them to executed criminals, who were neither numerous nor popular with the crowds that rioted to recover their bodies. By the eighteenth century, demand from expanding medical schools had spawned the profession of the body snatcher, who dug up fresh graves and sold the contents to anatomists, no questions asked. The trade reached its nadir in Edinburgh in 1828, when William Burke and William Hare skipped the digging altogether and murdered sixteen people to supply the school of Dr Robert Knox.
Public outrage produced the Anatomy Act of 1832, which allowed anatomists to claim unclaimed bodies from workhouses and hospitals. The act ended the murders but shifted the burden of dissection onto the poor, a fact that made dissection deeply feared by working-class families for another century. Only in the twentieth century did voluntary donation programmes, now standard in medical schools worldwide, begin to replace the coercive systems of the past.
Meanwhile, technology was revealing anatomy that no scalpel could reach. The invention of the microscope in the seventeenth century enabled Marcello Malpighi to describe capillaries, finally explaining how arteries connect to veins, and Antonie van Leeuwenhoek to observe blood cells. In 1895 Wilhelm Rontgen's discovery of X-rays allowed the living skeleton to be examined without breaking the skin, and the computed tomography scanner, developed in the 1970s, could build three-dimensional images of soft tissue. The Visible Human Project of the 1990s went further still, slicing frozen cadavers into thousands of sections and photographing each one to create complete digital atlases of the body.
Today the study of anatomy looks nothing like the crowded theatres of Padua, yet it faces its own debates. Many medical schools have reduced or abandoned full cadaveric dissection in favour of plastic models, virtual reality and pre-dissected specimens, arguing that these are cheaper and carry no safety risks. Defenders of the traditional approach counter that screens cannot teach the variation between real bodies, or the respect for donors that dissection instils. Surveys of newly qualified doctors suggest the argument is unresolved: confidence in anatomical knowledge varies widely between schools, and some studies link the decline of hands-on dissection to a rise in procedure-related errors.
Whatever methods prevail, the historian's lesson is constant. Anatomy advanced only when its students looked for themselves rather than trusting inherited authority - a principle that took Vesalius to the dissection table and that still separates observation from assumption in every medical classroom.