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The motions of our muscles are controlled primarily by motor strips in each hemisphere [of the brain], which control motion in the opposite side. Thus, our right hand obeys our left brain, and vice versa. Our perceptions of what is happening in these same areas are relayed from sensory receptor cells throughout the body to somatosensory areas positioned immediately below these motor strips. The exact places where each muscle is directed and perceived have long been mapped. By far the most space in these motor strips is dedicated to the lips, the hands, the feet, and the genitals.
-- Allen Shawn, Wish I Could Be There
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