"Hidden Brain" Image In Michelangelo's "The Separation Of Light & Darkness"

Recently some researchers at Johns Hopkins University believe renaissance artist Michelangelo possibly hid something within one of his Sistine Chapel art. It may be an anatomically accurate painting of the human brain.

Anatomically correct is interesting because it would be rare that in those days someone would know the true look of the brain without being a mortician. Research told them he had dissected bodies for a while while with the Medici house as a young adult, thus learning gross anatomy.

So in the neck of the image meant to be god, they believe they found the human brain. The Separation of Light from Darkness work is above the chapel's altar, according to Dr. Rafael Tamargo, a neurosurgery professor and co-author of the article in the journal Neurosurgery.

"As we studied the lines that Michelangelo had included in the neck, we were surprised to find that if you follow these lines, you can actually draw an anatomically correct view of the brainstem," stated Tamargo.

My question is, was he trying to paint around what would be a true form of the body, using it perhaps as an outline, or is it meant to symbolize something? Some believe it to be nothing more than a signature which does not appear on the work. Either way I find the debate about it to be quite fascinating and let the arguments continue.