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Closed head injury refers to a head injury in which the meninges are still intact. Although there are open wounds on the scalp and skull, the contents of the cranial cavity do not have much contact with the outside world, so it is also called a closed head injury. To be more precise, it should be a closed brain injury, because the scalp and skull, which belong to the same part of the skull, can have external open injuries, but the main fatal center is still concentrated inside the skull.

When the head is hit in a stationary state, since the head is connected to the neck and torso, the range of its movement in the direction of violence is limited to a certain extent, and the violence cannot be attenuated accordingly with the help of head movement. In this way, the force borne by the hit part is greater, causing skull deformation and even fractures. Therefore, brain damage occurring at the impact point is usually severe. In addition to contusions and lacerations of the cerebral cortex, the white matter of the brain is also often affected.

As for the contralateral part, the head is fixed by the neck and trunk and the violence is attenuated due to deformation or fracture within the skull. Therefore, the movement range of the brain in the contralateral part is also limited in the cranial cavity. The chance of bridging vein tearing is less, and the range of friction and impact between the brain surface and the rough surface or bone ridges inside the skull is also smaller. Therefore, brain damage in the contralateral part is lighter. This is a general characteristic of accelerated brain injury. However, boxing injuries are somewhat different. When a boxer is hit by another boxer's soft fist, the impacted area is less likely to cause skull deformation or fracture, so the energy of the violence cannot be attenuated, causing the victim's head to move over a larger range.

Because this disease is related to the head, it has to be serious. Craniocerebral injury is not the most serious, and its associated complications are the most difficult. Therefore, the general treatment process requires choosing a regular hospital. Small hospitals generally do not have the conditions for such treatment. Therefore, once this disease develops, it must be taken seriously.