Abstract
1. In anesthetized or decerebrate cats and dogs the effect of stimulation of the carotid sinus upon the activity of the long ciliary nerve was investigated by means of action potential study.
2. Electrical stimulation of the central end of the severed sinus nerve caused dual effects, inhibitory and facilitatory, in the impulse activity of the long ciliary nerve. However, raising the pressure in the carotid sinus, isolated and perfused, evoked only diminution or abolition of the ocular sympathetic activity, and such an inhibitory effect was abolished by cutting the sinus nerve.
3. From these results, it is concluded that the afferent impulses from the carotid sinus baroreceptors reflexly inhibit the impulse discharge from the ocular sympathetic centers.
