When I was at school, learning about the human anatomy involved flicking through a tatty old textbook from the 1970's with a picture of a naked man and women who wouldn't look out of place in Little Britain.
Nowadays, kids (and adults of course) have high tech 3D computer models such as BoneLab which help bring the body to life and help you memorise more easily parts of the body like the tibia, fibia and... erm... brain. BoneLab allows you to browse all bones in three dimensions. The models are all high quality and support free rotation and zoom so you view them at just about any angle.
It should be noted that BoneLab is not really suitable for kids because it's quite a technical application full of detailed and complex descriptions of the human body. For medical professionals and students it's a dream however as BoneLab features links to Wikipedia for complex anatomical terms.
There's little to criticise in BoneLab as it does an excellent job of making learning about the human body that bit more fun. Perhaps some videos would have been nice though.
Highly detailed and annotated body parts
Free rotation in 3D
Can't "undo" actions
Excellent Software, it can undo and is multilanguage, the 3D is excellent is perfect for teaching, it has al the thing's you need for doing a good work or homework