Filmmaker James Gunn has collected on his website a number of anatomical takes of cartoon characters. There are too many to show here, so if you like these go to jamesgunn.com for more.
Even early on, Giacometti once wrote, he had struggled to describe a "sharpness" that he saw in reality, "a kind of skeleton in space"; human bodies, he added, "were never for me a compact mass but like a transparent construction."