About the mouse thing

So in that article What I liked was that we finally found a detailed drawing of the mouse brain which is so similar to our so we can find out what our brains are like. So if recent years everyone was thinking what does our brain look like thanks to the mice we are closer to finding out what our brains look like. This discovery is really good and can help us do stuff.

What I don’t get is that we studied mice brains a lot but why have we only started finding stuff. and if this was found a few days back when did we find out we had brains couldn’t we get the brains off a dead person to find everything out.