The cerebrum is the largest and most developed part of the human brain. This part of the brain is associated with functions such as thought and action. The cerebrum is also responsible for the ability to solve problems, coordinate movements, and make decisions. It encompasses about two-thirds of the brain mass and lies around most of the structures of the brain. The outer portion of the cerebrum is covered by a thin layer of gray tissue (1.5 mm to 5 mm) called the corpus callosum. The cerebrum is highly wrinkled. Essentially this makes the brain more efficient, because it can increase the surface area of the brain and the amount of neurons within it. A deep furrow divides the cerebrum into two halves, known as the left and right hemispheres. The two hemispheres look mostly symmetrical yet it has been shown that each side functions slightly different than the other. Sometimes the right hemisphere is associated with creativity and the left hemispheres is associated with logic abilities. The corpus callosum is a bundle of axons which connects these two hemispheres.

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