Why does the brain, despite being a very vital organ, not have any pain receptors?
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What benefit would that bring exactly?
You must consider that brains evolved from a centra crossroads of cells that reacted to things. This is why some animals like octopus the brains in a rather silly place. In octopus they are around the esophagus and limiting the size of them. Why? Because when they first developed, they were just there to basically control eating.
If you look at the structure of the brain, the very core parts of them are really simple and small, and handle very simple things like swalling, breathing, intenstines. These were deep inside the body of the animal. Everything just evolved on top of that. There has been no situation in which there would been need for the nervous system to have brain receptors, they aren’t supposed to be in contact with the outside works to begin with. To have them would be just waste of energy and resources.
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