The first anatomical theatre was built at the University of Padua in 1594. I was intrigued by the fact that even music was played live during some of the public dissections performed in such venues. The first opera was believed to be Dafne by Jacopo Peri, created in Florence around 1597 or 1598. Its creation could be interpreted as a kind of public dissection of what was thought to be a Greek tragedy. Theatricality of human body is emphasized by offering drama of its interior, and at late 16th century it was, obviously, tendency in different spheres of life.
It looks like in "Man is for Man, Music, Mozart" Peter Greenaway already had that in mind.