The Lobes of the Brain!
The brain! Man, the brain is complex. But here are some basics - the brain is divided into lobes. Each lobe controls certain body functions. The left side of the brain controls the right side of the body and vice versa. If you look closer at the motor and somatosensory cortex, you see that certain sections of the motor cortex control movement in certain parts of the body and certain sections of the somatosensory cortex process what you feel in certain parts of the body - depicted by the homunculus. It’s fascinating to see how much of the motor and somatosensory cortex are dedicated to different areas of the body. This is a general understanding. Your circumstances, trauma, injuries, time spent doing things, etc, can alter your homunculus
Disclaimer: The information provided is for educational purposes only and does not take the place of medical advice.