subcortical

/S AH0 B K AO1 R T AH0 K AH0 L/
adjective
  1. 1

    Of or pertaining to the subcortex, the portion of the brain located below the cerebral cortex

    โ€œHe was diagnosed with subcortical dementia.โ€

Source: https://en.wiktionary.org/wiki/subcortical