Vesalius published an anatomy book in 1534 that showed a dog muscle in a human figure to disprove theories of Galen, demonstrating his desire for accurate anatomy understanding. Da Vinci drew one of the first depictions of a fetus in utero in 1510, capturing life's emotions. Eustachi accurately depicted nerves in 1714, though his work was not published until later. Gray featured the optic nerve in his 1858 anatomy book, reminding the author of Gray's past achievements in nerve distribution studies.