Blunt trauma Consider the occupant of a motor vehicle. This is dissipated very rapidly in a collision. Injury is sustained because of the development of pressure waves radiating from the points of impact through the victim. They are typically irregular in outline with edge abrasions. Nerves and vessels may bridge wound.
Abrasions are usually secondary to being dragged.
Skin tags usually identify the direction of dragging. A yellowing bruise is at least two days old. Air-containing tissues are quite susceptible to injury. Lung damage and eardrum rupture require relatively little overpressure to produce. The human body is surprisingly robust, however.