Each part of our body actually is mapped to certain regions within the somatosensory cortex (a slice near the middle of the brain). It’s just the result of a bunch of nerve endings within our dermis / throughout the body in general.
Highly recommend looking up a brain homunculus. They map out what parts of the cortex correspond to what parts of your body. It’s very interesting and makes a lot of sense seeing how something like your hands take up a larger percentage of the cortical area compared to something like your trunk.
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