The Cerebrum takes up 9/10 of the brain it is used for language, thinking, communication, and more. Your cerebrum is made up of two hemispheres. the left cerebral hemisphere is mostly responsible for speech,reading,writing, and arithmatic. The right cerebral hemisphere ia mostly responsible for awareness,appreciation,,insight,imagination, and creativity. both halves of your cerebrum are connected by bundles of nerve fibers the most important being the Corpus Callosum.