Closed Head Injuries
One of the two major types of traumatic brain injury (TBI) is the closed-head injury. This is a TBI that happens when a sudden jolt or blow to the head moves the brain violently within the skull, causing brain damage.
The other type is a penetrating brain injury, in which the skull is pierced.
A minor closed-head injury may cause temporary dysfunction of brain cells, making the victim feel dazed, confused or knocked out.