Meet Joe. After suffering from years of epilepsy, Joe underwent brain surgery to have his corpus callosum severed. The corpus callosum, also referred to as the colossal commissure, is a thick band of 200-250 million nerve fibers at the longitudinal fissure that facilitates  interhemispheric communication in the brain. By having this band severed, Joe prevented the spread of epileptic seizure from one hemisphere to the other.

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