Just a guess. I would suggest searching Autocad/3Dstudio/Lightwave/Softimage models in 3D CG groups. In 90s I've seen pretty detailed models of human head with parts in separate models. I mean separate ears, eyes, noses, teeth. I believe there are a lot of them because CG guys like different faces blown up and draw every time everything from the scratch. The real problem is material. Guys from our lab, for example, spend several years finding perfect salt solution and fertilizer jelly for quasi-homogenous modeling of human flesh. I've seen several papers just on modelling losses in eyes.