<prompt> In Chevallet fracture of nasal septum the mechanism of trauma is:Blow from aboveBlow from belowBlow directly from frontAny of the above  <response>: b Blow from belowRef. Scott Brown, 8th ed., Vol 3; 1127Blow directly from front will cause Jarjavay fracture.Blow from side may depress only one nasal bone. Side force can cause severe septal displacement, which can twist or buckle the nose. 