Banjo Johnny - if you want to know more about how human body parts were used in (and as drums) get ahold of Mickey Hart's (of Grateful Dead fame) books "Drumming at the Edge of Magic" and "Planet World." There is some interesting stuff in both of them.

The Field Museum of Natural History in Chicago has a good selection of part-human instruments also. My sister works at the museum, so I've heard some interesting stories regarding some of the stuff there.