Nervous efferent activity in the ciliary nerves related to intraocular pressure changes

Abstract Efferent activity in the short and mixed ciliary nerves was recorded in 27 cats. When intraocular pressure was artificially varied, changes in the frequency of nervous impulses were found in 14 experiments. Among the pressure-sensitive fibres, one group increased their firing frequency when intraocular pressure was elevated, while other fibres reduced their frequency of impulses when intraocular pressure increases were made. These fibres could be efferent pathways involved in the nervous regulation of intraocular pressure.