Abstract
The Audiometric findings and the mechanism of traumatic injury due to head trauma to the hearing organ are described and discussed exclusively in cases in whom the locations of head injury were far from the hearing organ.
Interruption of the ossicular chain was found by impedence audiometry in cases of head collision happened in a slow speed, for example falling on road. Hair cell damage was found more severely in the ear opposite to head trauma in which collision was made by a small heavy piece with a high speed than in the other ear. This mechanism is here called “contre coup” and discussed dynamically. Central deafness due to the temporal lesion is detected in the ear opposite to the side of the head trauma with a temporal bone fracture and brain damage.
