1. The cerebrum is the uppermost part of the brain. Above the pons, cerebellum, and medulla.
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2. Determinin intelligence and personality, thinking and perceiving, producing and understanding language, interpretation of sensory impulses, motor function, planning and organizing, and touch sensation.
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3. You would be almost brain dead if your cerebrum didn't work.
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4. It takes up two thirds of the brain, it's also called the telencephalon, it's outer layer is the cerebral cortex.







Sources:
http://biology.about.com/od/anatomy/p/cerebrum.htm
faculty.stcc.edu