 This is one reason why the nomenclature selected by the Nomina anatomica and the "Terminologia Anatomica" (1998) is hardly applicable.The evolution of the thalamus follows that of the cortex and there are differences including between primates (new world monkeys and old world; old world and humans), which means that a universal nomenclature valid in all species is not simply reachable.The superior region comprises two elements that were linked during a long time and were later wrongly separated