Progressive supranuclear palsy: Electromyographic examinations of eye muscles

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Abstract
Electromyographic examination of vertical and lateral extraocular muscles was carried out in 5 patients suffering from progressive supranuclear palsy, and incapable of performing voluntary vertical eye movements. No evidence of a lower motor neuron lesion or paradoxical innervation of eye muscles was noted. Reciprocal inhibition of antagonist vertical muscles though present in oculocephalic (doll''s head) stimulation, was incomplete on attempted voluntary movement. This factor is probably the immediate cause of vertical gaze palsy.