Relax, this won't hurt a bit..."
There are no pain receptors in the brain. That's why surgeons can perform brain surgery on a patient why they are still awake. This helps them ensure that the delicate procedure doesn't screw up any vision or motor control functions – and also it looks really freaky. Why do we feel pain? Because a nociceptor, a sensory receptor, sends signals to the spinal cord and brain alerting us to danger.
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