This is the most complete and accurate anatomy model I have ever seen. This Ztool is a compilation of hundreds of obj files that were released by a university in Arizona several years ago. ALL MESHES FROM CT SCAN DATA. It is comprised of 32 subtools, and each of those contain individual meshes for each muscle/organ group. I have been hosting it from my Google Drive, and finally decided to open a CubeBrush store to give it a final home. It is free to all, as it always has been. If you need to learn anatomy, for any purpose, then this asset should help you immensely. Hit the link.
I realize not everyone is a zbrush user. The polycount in this model is hefty. For those of you who would like the model in obj format, I will be uploading files in the coming days. I amburied in work at the moment.