There are two types of traumatic brain injury or TBI. The first is called closed head injury, which generally is the result of an event like a car accident. In this scenario, the head whips back and forth or side to side, hitting against the inside of the skull at a very high rate of speed as it does. This knocking around of the brain causes tissue to be bruised and blood vessels to be torn within specific areas of the brain. The brain regions that are most often affected by a closed head injury are the frontal and temporal lobes.

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