Interesting, that I wouldn't be surprised if that is what the Eye of Horus was symbolizing. Because, of course the Egyptians knew about the brain. if you look at the medical papyrus, they had an EXTENSIVE knowledge of anatomy and physiology.
“ The human body, like that of the universe, is considered to be a material expression of ten globes or spheres of light(of the Tree of Life). Therefore man is called the Microcosm, the little world, built in the image of the great.