As new ideas about human anatomy and iatrochemistry started to be shared, doctors were inspired to challenge the old teachings and investigate for themselves
Dissection, which had once been banned by the Church, was legalised due to the decline in the power of the Church, but it was still very difficult to get a supply of fresh corpses to dissect
Protestantism rejected highly-decorated churches, so many artists found themselves with hours to spare and in need of work, which meant that they were available to create detailed drawings for the new medical textbooks