That is great!
It's a good game for me to test my knowledge that is left of my anatomy-studies and to own some "subject specific english". I would also love to see this kind of games for cardiology, the renal structures and other parts of human anatomy.
Also it's really good that you can click on the names and the image shows the area where it can be found, especially for not native speakers like me. ;)
I really loved the 1st game but the 2nd and the 3rd a little bit disturbed me. At the 2nd game I didn't want to put the Jejunum after the Esophagus just because they are beneath each other, although there had been enough in-between-steps some blocks ahead. I wanted the possibility to put all of them in a correct order, whether or not they are next to each other. But maybe it's just my perfectionism.
The 3d was the same problem for me and the blocks came too quick to think about a good combination (especially because in all my 3rd-game-tries the blocks fell only in 2 or 3 rows down and so the deadline was reached too fast).
I'd gave it a 5-Stars-Rating, if the blocks in 3 would fell more spread and more slowly and if you weren't forced to take low combos / make gaps in the order, so I took a half star for the 2nd and the 3rd game but you can also take the -1 star for my personal taste. :)