Homunculus

Homunculus literally means "little man" and it is used to show the amount of brain power dedicated to each body part.  The motor homunculus shows the amount of brain power used to control each body part.  The facial regions and the hands have the greatest area.  In the sensory homunculus, the amount of brain power used to feel different parts of your body is shown.  Likewise, the facial regions and the hands are the greatest; therefore, they have the most feeling.