In contrast the simpler parts of the movement repertoire that tend to focus more on the distal musculature are emphasized in the more posterior cortex. In this alternative view, though movements of lesser complexity are emphasized in the primary motor cortex and movements of greater complexity are emphasized in the caudal premotor cortex, this difference does not necessarily imply a control hierarchy. Instead the regions differ from each other, and contain subregions with differing properties, because the natural movement repertoire itself is heterogeneous. References Cerebral cortex