How did Andreas Vesalius challenge Galen’s anatomical descriptions?

Andreas Vesalius challenged the anatomical authority of the Greek physician Galen by shifting the focus of medical education from the rote study of ancient texts to direct, hands-on dissection of human cadavers.21

While Galen’s work was considered authoritative for centuries, Vesalius realized through his own dissections that Galenic anatomy was fundamentally flawed because it was based on the dissection of animals—such as dogs, monkeys, and pigs—rather than humans, due to Roman religious prohibitions against human dissection at the time.23

Vesalius revolutionized the field by:
* Performing his own dissections: He rejected the traditional practice of relying on untrained assistants to perform dissections while he lectured, insisting instead on conducting the procedures himself to ensure accuracy.21
* Critical verification: He encouraged younger scientists to adopt a critical mindset, accepting anatomical descriptions only after personally verifying them.1
* Publishing the Fabrica: In his 1543 work, De humani corporis fabrica libri septem, he provided a more extensive and accurate description of the human body than any of his predecessors, effectively exposing many of Galen’s errors.23