This app was mentioned in 4 comments, with an average of 1.75 upvotes
There is a great free app(iPhone and Android) for brain structures called 3dbrain. https://play.google.com/store/apps/details?id=org.dnalc.threedbrain https://itunes.apple.com/us/app/3d-brain/id331399332?mt=8
I used this in college to study: https://play.google.com/store/apps/details?id=org.dnalc.threedbrain
I love http://www.g2conline.org/
Which makes the 3D Brain app
And this app is great too, but you have to pay a little to unlock the whole thing