Andrew Huberman· PhD
The brain itself, meaning the brain tissue, does not have any sensory neurons. What do I mean by that? Well, if I touch the top of my hand, I can feel that. ... We have no sensory neurons on our brain. This is one of the reasons why you can remove the skull and do brain surgery on somebody who's wide awake and be poking around in there, and they don't need any anesthetic on the brain itself.