This is the closed neural network. It consists of closed blocks of neurons. One such block consists of three neurons which are connected between each other. All their axons and dendrites are connected each to other. There are no any open ends (It is right that all ends are connected). One block which you can see on 360 picture consists 33000 polys. The scene consists of 8 clones of it. You can make many clones of this block to create large neural network.
All textures in the main scene are 3ds max procedural. Also there is the zip archive neurons_baked.zip. It contains alternative scene and .obj and .fbx models with baked 16K textures. If you don't use 3ds max you can take them.