Why do your fingers have more designated cortex area (in the sensory and motor cortices) than your upper arms do?

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asked Aug 8, 2020 198k views

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Davidson · Answer 1 · 2020-08-13T03:06:54+0000

The reason you are more sensitive on your fingertips than your elbow is that there are many more sensory neurons on your fingertips. When an area has more sensory neurons there is a larger brain area devoted to receiving their signals, meaning more sensitivity.

Why do your fingers have more designated cortex area (in the sensory and motor cortices) than your upper arms do?

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