Manga: Claymore

[Buffalobiian]

Of course it's never specifically been said. It's just tremendously obvious, especially since the only piece of Teresa that Clare brought into the Organization was her head.

I think that's symbolic more than anything else. Clare was to take a piece of Teresa with her on her quest to find/follow a Man-in-Black. The head would be the thing that'd symbolise Teresa the most during that journey. Teresa's head was also conveniently lying on the ground. Had Clare tried to use anything else instead she would have had to hack away at Teresa's body.

And that's not to say they even used her whole head. Subs/scans generally use "flesh", though it might not necessarily exclude bones/skulls in the native Japanese context.