Figure 34.29: The Body Is Represented in Maplike Ways in the Primary Somatosensory and Primary Motor Parts of the Cerebral Cortex The amount of cortical tissue devoted to various body parts is not even. More cortical tissue is devoted to some body parts than others, as reflected in the sizes of the parts in the drawings. (A) The primary somatosensory cortex. (B) The primary motor cortex.