IPA: /ˌsʌbˈkɔːrtɪkəl/
KK: /sʌbˈkɔrtɪkəl/
Relating to the part of the brain that is located beneath the outer layer called the cerebral cortex.
The subcortical structures play a crucial role in regulating emotions and memory.
Subcortical → It is formed from "sub-" (meaning under) and "cortex" (from Latin, meaning bark or outer layer). The word "subcortical" refers to structures located beneath the outer layer of the brain.
Think of something that is located 'under' ('sub-') the 'outer layer' ('cortex') — that's what subcortical means.