I saw the following at Costco some time ago, that your DS might like, if he's into anatomy: something like a big board book with clear plastic pages, each of which has a different human anatomical system. E.g., the first page is the skin/hair/nails/outside, then a page with musculature, a page with the nervous system, etc., down to the last page, with the skeleton. He might get more out of that than a model with no additional information on it. I think it's called Uncover the Human Body.

...pronounced like the long vowel and first letter of the alphabet...