 In cats and rodents the internal globus pallidus is known as the "entopeduncular nucleus".In birds the striatum is called the "paleostriatum augmentatum" and the external globus pallidus is called the "paleostriatum primitivum".A clear emergent issue in comparative anatomy of the basal ganglia is the development of this system through phylogeny as a convergent cortically re-entrant loop in conjunction with the development and expansion of the cortical mantle.