Injury to the head that may damage the scalp, skull or brain. Head injury may occur either as a closed head injury (e.g. the head hitting a car's windshield) or as a penetrating head injury (e.g. when a bullet pierces the skull).
World Health Organization WHO, Glossary & Partner Organizations Helmets: A Road Safety Manual for Decision-Makers and Practitioners (and "How to" road safety manuals), United Nations Road Safety Collaboration Partners, Geneva, Switzerland, WHO 2013. http://www.who.int/roadsafety/projects/manuals/hel met_manual/Glossary.pdf, www.who.int/violence_injury_prevention/, (Road Trfc and Transp Sfty - Brit) {600}