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The afferent path to the pupillo-constrictory centers from the retina was studied by numerous authors and clarified considerably in detail, whereas the optic afferent path to the cilio-spinal centers in the spinal cord remained entirely obscure. Some authors doubted whether the ocular sympathetic fibers exerted for the development of the pupillary light reflex for the reason that the pupillary movements provoked by lighting the retina were scarcely recognized after the severance of the ocular parasympathetic nerves. It was however unequivocally demonstrated, in our recent reports8,9). that the pupillary light reflex was mediated not only through the parasympathetic nerve but also through the sympathetic nerve the activity of which was inhibited in the light reflex. The following experiment was designed to decide the central path to the cilio-spinal centers from the retina by observing the response in the activity of the ocular sympathetic nerve to lighting the retina after various lesions of the brain stem and cutting the optic tract. From the obtained results, a new schema concerned with the light reflex path was induced.

THE CENTRAL PATH OF THE LIGHT REFLEX VIA THE SYMPATHETIC NERVE IN THE CAT