Forensic scientists collect DNA from cast-off bits of people such as skin cells, blood, and hair. In many magical traditions, such as Voudoun, bits of a person can be used to direct a spell - blood, nail clippings, saliva, etc.
Is there a term that covers "all the bits and pieces that make up a person or animal"? The context is mythology, so an obsolete or archaic word would fit in just fine.
Detritus is the closest I've come up with, but I'm not quite happy with it. I don't necessarily mean "bits which have been cast off," but really all the elements of an animal. A word or phrase which means "fur, skin, feathers, and/or bone" would be about right. "Organic matter" has the right technical meaning, but it's, well, too technical.
Clarification: I don't actually need a single word, a short phrase would be fine. There doesn't seem to be a tag for "word-requests" alone.