The left and right sides of the brain are connected by a great number of nerve fibers in a healthy brain the two sides communicate with one another the two sides do not necessarily have to. Specifically in left handers the motor cortex in the right side of the brain the left side of the body is controlled by the right side of the brain and vice versa is dominant for fine motor. Generally speaking the left side of your brain controls the right side of your body and the right side of your brain controls the left side of your body according to the website the brain from. The ideal scenario is to use both sides in a balance because the right brain and the left brain complete each other just like in the example above the more used side of the brain becomes more functional and the less used side becomes lazy you are probably wondering which side of your brain you are using more effectively