Body Atlas

The Four Lobes · Brain

Why does a paper cut on a finger hurt so much?

Body parts get cortex in proportion to sensitivity, not size.

The simple answer

There's a map of your body laid out across a strip of your cortex — but it's wildly out of proportion. Your lips and hands take up enormous territory. Your back, which is far larger, gets almost none.

Go deeper

There's more: body parts get cortex in proportion to sensitivity, not size. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

Explore this concept in Body Atlas →

Body Atlas is an educational product. It does not provide diagnosis, treatment, or personal medical advice. · Privacy