Cerebral CortexWhere is it located in the brain?The Cerebral Cortex is the wrinkled outer surface of the brain.
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http://www.brainexplorer.org/glossary/cerebral_cortex.shtml

What is the function?

The Cerebral Cortex controls how you think, see, speak and your memory. It also affects your social abilities.

What could happen if it no longer worked properly?If your brain is injured and your speech center is damaged, you may not be able to talk clearly. If your motor area is damaged, you may not be able to walk as well as you did before or you can be paralyzed.