This medical illustration series depicts a closed head coup and contrecoup injury resulting in traumatic brain injury (TBI). As the drawings show, force from a head-on collision causes the head to move rapidly forward. The brain, within the cranial cavity, suffers a contrecoup injury by striking the inside of the back of the skull, opposite side of the impacting force. Secondarily, the coup (or 'blow') part of the injury, occurs when the brain strikes the interior of front of the skull. more