Impact biomechanics research on the head has frequently looked at fatal cefebfal lesions. In the head trauma population, there are patients with no brain injury, but. presenting labyrinthic commotions. The important factor here is less the probability that an inner ear lesion occurs, than the bringing in of this kind of lesion to the head tolerance limits research.

Initially we briefly review the clinical observations, i.e. vertigo, deafness, etc... We then examine the mathematical models which describe the semicircular canal, cupula and macula.

Finally the results are related to the theoretical values of mechanical parameters applied to the different inner ear organs in cases of extreme linear and angular accelerations as found in the literatute.