There’s an amazing high res ex-vivo scan available for anyone interested in looking at the glories of the human brain. Be prepared for a long download and some slow operations. But once it’s loaded it’s really interesting to look at. If your machine is reasonable in terms of ram most operations like slice pan/zoom/scroll are very interactive in all planes (I tested on a recent mac book air for example).
The example videos below were made with the SceenCapture module (actual time for volume rendering is a few seconds per frame).