I recently started teaching myself anatomy, and became quite fascinated by the structure of bones ( have not reached yet the tendons and muscles part of the book, which might be interesting aswell) what I love about bones is the logic (everything fits like legos), also, the way they look (no explanation required). It is a shame most art-schools no longer include it into their curriculum.
tribute videos:
bones by the killers (back when they were semi-cool) directed by Tim Burton
and the classic: