There are two classifications of head injuries: closed injuries and penetrating injuries. In a closed injury, the head sustains an injury from a blow or jolt. This can result from a direct hit to the head or from a force on the brain inside the skull. The most common types of closed head injuries are concussions and contrecoup injuries from vehicle crashes. In a penetrating injury, also known as an open injury, an object may impact the head or enter the brain, causing an open head wound and injury deep inside the brain. Penetrating injuries can be caused by acts of violence, being hit by tools or falling objects on a worksite, or an act of medical negligence. Such injuries may result in losses of daily functions, and it is important to immediately seek medical attention and consult an experienced personal injury attorney.