"He recognized that the brain was an important structure, and I think he included it in the creation of the universe because he recognized that this is one of the most magnificent things that God had created," Tamargo said.
The brainstem is the most primitive part of the brain, through which all signals traveling to and from the brain must pass, Tamargo said.
In the image above, on the left, you can see a comparison between the neck of God in the painting and a real brain stem. On the right, notice the different angles of light on the figure, which was uncommon for Michelangelo.