Herophilos was the first scientist to systematically perform scientific dissections of human cadavers. He was the first scientist to systematically perform scientific dissections of human cadavers. Laboratory work was uncommon, and dissections were rarely done because of legal restrictions on cadavers. Teaching in gross anatomy is assisted by exploratory dissection of cadavers. The Mongols practised biological warfare by catapulting diseased cadavers into the cities they besieged. Leonardo da Vinci made his anatomical sketches based on observing and dissecting 30 cadavers. The use of traditionally embalmed cadavers is and has been the standard for medical education. This book contained many different anatomic sketches that he made upon examining and dissecting cadavers. Medical and dental students in addition gain practical experience, for example by dissection of cadavers. Many medical schools rely on the donation of cadavers for the teaching of anatomy. Work by Vesalius on human cadavers found problems with the Galenic view of anatomy. Work by Andreas Vesalius on human cadavers found problems with the Galenic view of anatomy. Suibhne is haunted by headless cadavers and detached heads at Sliabh Fuaid. The first test subjects were human cadavers. The first surgical techniques were practiced on female cadavers.