The true reason behind the PCR tests?
(media.greatawakening.win)
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No, the brain tissue itself has no sensory neurons, so you can do brain surgery on conscious patients without anaesthetizing the brain. They need anaesthesia for the cutting into the skull bone.
You can slice your finger open with a sharp enough knife and not realize it until trying to do something pushes the wound open and shoves debris into it.
The brain is not particularly innervated with sensory neurons, but it does have some and when it aches, we should listen to it and not ignore it.