The human brain is responsible for many functions, and certain brain regions are responsible for specific tasks. For example, the part of the brain called the motor cortex controls movements of the fingers, hands, legs, arms, and other body areas. The motor cortex has a lot of brain tissue for hand and finger movement, which we need for writing, holding a screwdriver, or threading a needle. On the other hand, we do not have very precise control of our leg muscles, and so the motor cortex can control leg movement without quite so much brain tissue. Another important brain region is the somatosensory cortex, which is responsible for the sense of touch. Without touch, it would be very difficult to know how much to tighten a screw, or to hold fragile items like grapes or a bottle of Coke. People might accidentally crush the grapes or the Coke bottle without feedback from the brain about how much force their hands produce.

License information: nan
MPAA: G
Go to source: https://kids.frontiersin.org/article/10.3389/frym.2019.00016