During the Renaissance, physicians began to study medicine in a more scientific way by dissecting human bodies to learn anatomy. Andreas Vesalius and Leonardo Da Vinci created detailed anatomical drawings that improved understanding of the human body. Doctors also experimented on battlefields to develop new surgical techniques, such as using ligatures instead of cauterization. While some ideas from Galen remained influential, the study of diseases like the plague and syphilis forced doctors to develop new treatments through experimentation.