Example being poking a zit on the side of your face and then causing an itchy feeling on the back of your neck
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Look up dermatomes, basically your body develops in a segmental way, where sensation can be felt in a part of the body that receives innervation from nerves in the same spinal segments that innervation the area that is actually affected.
What you’ve described is somewhat different though, as side of the face is innervated by the trigeminal nerve and back of neck is cervical spinal nerves, so there is probably a different reason for that sensation.
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