I am trying to find 3D model of brains. I am particularly interested in adult-male -brains in Blender-model. I could find such 3D models of brains for sale here but because I am researching I would like to use some open-sourced candidate so anyone could preview things. So does there exist 3D models of brains in Blender?
That one is only 30 which really isn't bad for a model. You will have trouble finding an anatomically correct model for free.
I am curious, is the male brain that much different from the female brain? And do you want just the brain or a whole head with the skeleton and other anatomical features? And if you would like to elaborate, I am curious about what end product you are looking for.
Side note: Autodesk has 'student' license version of software --in case you want to try learning Maya or 3Ds max, the latter has Retopology tools. You can download from here: https://students.autodesk.com/?nd=download_center
ITKsnap is a program you could use to get 3d data from ct or mri scans http://www.itksnap.org/pmwiki/pmwiki.php?n=Main.Downloads MRI and CT data can be found here: http://www.osirix-viewer.com/Downloads.html
I know you just wanted a free model, but the above are the steps to get to one at least.