Abstract
When man received dull External Injury on a head and died, generally Skull Fracture, Intracranial Haematoma, Arachnoid mater Haematoma, Brain Damage, etc. is the cause of death. Particularly, we call the local brain damage produced on the brain surface of the side which received the blow coup contusion, and without knowing why some which damage produces are in the opposite side of the shock part which has not received the direct blow. It calls contrecoup contusion. But, these are very difficult to judge what kind of shock received from the dissection view from the head. Then, it refers to the data of the easy shock experiment and past this time, and elucidation of head injury is advanced.
