Stimulation of posterior semicircular canal produces: (A) Horizontal nystagmus, (B) Veical nystagmus, (C) Rotatory nystagmus, (D) All of the above
Answer is B. Stimulation of semicircular canal produces nystagmus and the direction of nystagmus is determined by the plane of the canal being stimulated. Thus nystagmus is veical from the posterior canal. (Ref: Diseases of EAR, NOSE AND THROAT by PL DHINGRA - 6th Edition)