GABAergic interneurons (INs) account for about 20-30% of the whole neuronal population in the neocortex and are crucial to establish inhibitory modulation in cortical microcircuits. A wide diversity of cortical interneuron subtypes are described in the neocortex and developmental studies have provided new insights on the classification of cortical interneuron subtypes. During development, cortical INs originate from distinct areas of the subpallium, more specifically from the medial (MGE) and caudal (CGE) ganglionic eminences. After their generation, from these specific subregions they first tangentially migrate into the pallium and then invade the cortical plate...