a positive declaration intended to give confidence: He received assurances of support for the project. 2. promise or pledge; guaranty; surety: He gave his assurance that the job would be done. 3. full confidence; freedom from doubt; certainty: to act in the assurance of success.
Summary. Traumatic brain injury (TBI) happens when a bump, blow, jolt, or other head injury causes damage to the brain. Every year, millions of people in the U.S. suffer brain injuries. More than half are bad enough that people must go to the hospital. The worst injuries can lead to permanent brain damage or death.
A sharp blow to the head resulting from an assault or trauma that does not actually puncture the brain is called a: closed head injury. Closed head injury is: the most common cause of brain damage in young adults. Closed head injury results in damage partially because of: rotational forces that push the brain against the inside of the skull.