Before revision: History of dissection – During ancient times, investigators appeared to largely limit themselves to non-human animals.P Prioreschi, Determinants of the revival of dissection of the human body in the Middle Ages', Medical Hypotheses (2001) 56(2), 229–234 Roman law forbade dissection and autopsy of the human body,'Tragically, the prohibition of human dissection by Rome in 150 BC arrested this progress and few of their findings survived', Arthur Aufderheide, 'The Scientific Study of Mummies' (2003), page 5 so physicians such as Galen were unable to work on cadavers.
After revision: History of dissection – Roman law forbade dissection and autopsy of the human body,'Tragically, the prohibition of human dissection by Rome in 150 BC arrested this progress and few of their findings survived', Arthur Aufderheide, 'The Scientific Study of Mummies' (2003), page 5 so physicians such as Galen were unable to work on cadavers.