what is the purpose of a sensory homunculus? a. it maps out the somatosensory cortex in relationship to the corresponding motor outputs. b. it shows how areas of the body are represented in the primary somatosensory cortex on the basis of sensitivity. c. it delineates which areas of the somatosensory cortex require the greatest oxygen and glucose supply. d. it demonstrates how our sensory inputs are connected to the central nervous system.