Leonardo da Vinci originally planned to publish his anatomical notes in the form of a book. In this endeavor he had the support of Marcantonio della Torre, a professor at the University of Padua who shared da Vinci's interest in dissections and human biology. However, Marcantonio's life was cut unexpectedly short by the plague, an event that severely curtailed da Vinci's attempts to publish his notes. Coupled with political turmoil in Italy that following year, it spurred da Vinci's relocation to France, and the eventual ending of any of his attempts to bring his anatomy work to the general public.

Source:
"Marcantonio della Torre." https://en.wikipedia.org/wiki/Marcantonio_della_Torre.

Image source: https://commons.wikimedia.org/wiki/File:Marc_Antonio_della_Torre_(Turrianus)._Line_engraving,_1688._Wellcome_V0005857.jpg