THE EFFECTS OF STIMULATION OF THE CAROTID SINUS BARORECEPTORS UPON THE ACTIVITY OF THE LONG CILIARY NERVE

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Abstract
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 potentials. Electrical stimulation of the central end of the severed sinus nerve caused dual effects, inhibitory and facilitatory, in the activity of the long ciliary nerve. However, raising the pressure in the isolated and perfused carotid sinus evoked only diminution or abolition of ocular sympathetic activity. Such an inhibitory effect was abolished by cutting the sinus nerve. It was concluded that the afferent impulses from the carotid sinus baroreceptors reflexly inhibit discharge from the ocular sympathetic centers.

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