CLOSED HEAD INJURY: How is the brain damaged in a Closed Head Injury after an auto or motorcycle accident?

When the head or skull is struck by a blunt force or a sudden, violent movement, the brain moves within the skull. This sudden, forceful movement can create microscopic tears in the brain tissue, and it can rupture blood vessels, causing what is called "brain bleeds."  As the brain hits the skull, it becomes bruised, leading to swelling and pressure, causing neural damage which interrupts nerve signals to the nerve core of the body.