on compression, the nystagmus is to the healthy side, and the slow component
to the diseased side. (The reversed fistula symptom may be produced in cases
of undue mobility of the stapes.) A positive fistula test is also present after the
operation of labyrinth fenestration for the relief of deafness in otosclerosis.
Fig. 154. Electronystagmograph recordings. A, Nystagmus to the right; B, Nystagmus to the left.
Examination of the auditory and vestibular system is not only of importance
in diagnosing conditions of the external, middle and inner ear. It also plays
an essential part in the investigation of lesions of the auditory and vestibular
nerves and of their central connections.