The cortex makes up the surface of the ; forebrain
The region of the brain that is responsible for activities ( brain activities ) such as planning, problem solving and impulse controls is the frontal/forebrain and the outermost layer of the frontal/forebrain is made up of the cerebral cortex
The cerebral cortex is the regarded as the information processing center of the human brain because very high sensitive information and actions are collected and interpreted there. it is also the brain's largest part.
Hence we can conclude that cortex makes up the surface of the Forebrain
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