only in taxon only_in_taxon develops_from develops from develops from Mammalia cortical intermediate zone UBERON:0004040 uberon cerebral cortex mantle layer EMAPA:17545 cerebral cortex mantle zone IZ EMAPA:32712 cortical mantle layer The region of the developing mammalian cortex that extends between the ventricular zone and the cortical plate (CP); normally, the IZ is a region of tangential migration of cells, and at midgestation, the lower part of the IZ develops into the subventricular zone. neural tube mantle layer layer of developing cerebral cortex