II. The influence of the cerebral cortex on the larynx

I have much pleasure in thanking Professor Victor Horsley for allowing me to conduct the experiments which form the subject of this paper at the Pathological Laboratory of University College. It has always appeared to me contrary to the best established facts with regard to the cerebral localisation of motor processes that some abduction of the vocal cords should not be represented in the cerebral cortex. That abduction should be less powerfully represented in the cortex than adduction seemed clear, but that there should be no centre at all to subserve this function in the cerebral cortex seemed strange. I therefore decided to test the matter on the lines suggested to me by Dr. Hughlings Jackson in connection with a recent investigation of eye movements, when, after excluding the possibility of the lateral movements of the eyes to the opposite side from the hemisphere stimulated taking place, by dividing the muscles which bring about these movements, I found that it was possible to evoke many other movements of the eyes which hitherto could not be obtained. The conclusion which appeared warranted by these results was that the lateral movements of the eyes are so powerfully represented in the cerebral cortex that they overpower all other movements under normal circumstances.