Figure 46.5 The Body Is Represented in Primary Motor and Primary Somatosensory Cortexes Neurons in the primary motor cortex (A) control muscles in specific parts of the body, while neurons in the primary somatosensory cortex (B) receive information from specific parts of the body. The locations of these neurons within each cortex correspond to “maps” on which regions of the body are represented in proportion to the amount of innervation they receive.