PUPILLARY DILATATION PRODUCED BY DIRECT STIMULATION OF THE TEGMENTUM OF THE BRAIN STEM

Abstract
With the Horsley-Clark stereotaxic instrument and bipolar needle electrodes various points in the brain stem and ventral part of the diencephalon [apparently in cats] were stimulated with a faradic current of low intensity. Dilatation of the pupils could be obtained from many regions besides the subthalamic nucleus, and regularly from all points in the tegmentum of the mesencephalon and pons.

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