When I was in at Princeton in the late 80’s, I remember Pat Hanrahan talking about the Visible Human Project, a project to produce detailed 3-D models of both a normal male and female, using CT, NMRI and anatomical images. Yes, anatomical images.
They sliced the male up in 1mm intervals to match the imaging resolution of the CT scans. The female was sliced much thinner, at 0.33mm per slice.

Not content to leave cryosectioning to the trained biologists, numerous amateurs have gotten into the act as well. Witness The Visible Barbie Project.