The motor homunculus is a visual representation of the areas of the brain responsible for controlling voluntary muscle movements. It is typically depicted as a distorted human figure, where different body parts are sized according to the amount of motor control they require. For example, the hands and face are larger than the legs, reflecting their complex movements and fine motor skills. This representation is based on the organization of the primary motor cortex, located in the frontal lobe of the brain. The motor homunculus illustrates how specific regions correspond to different body parts, helping researchers understand the brain's role in movement and coordination.