A mouse-brain mouse designed by Jeff Emanuel with data from the Allen Institute's Mouse Brain Atlas, uploaded with permission. His instructions:

The shell fits on top of this mouse: https://www.amazon.com/Sabrent-Travel-Optical-Retractable-MS-OPMN/dp/B01MSJPX06

I intended to have the shell be removable like the top of the original mouse, so the stl includes tabs at the front and a screw post at the back. Neither of these worked well, so I trimmed those from the prints and just superglued the shell to the mouse base. There are some parts that print in the interior that should be removed. I found it was easy to snap them off instead of bothering to eliminate them in the stl.