homunculus: distorted human figure drawn to reflect the relative space human body parts occupy on the somatosensory cortex (sensory homunculus) and the motor cortex (motor homunculus). The lips, hands, feet and sex organs have more sensory neurons than other parts of the body, so the homunculus has correspondingly large lips, hands, feet, and genitals. Well known in the field of neurology, this is also commonly called ‘the little man inside the brain.’