Abstract
Based on immunohistochemical analysis of the trigeminal, superior cervical, ciliary and sphenopalatine ganglia and of the eye after sensory denervation and sympathectomy, cholecystokinin (CCK)-like immunoreactive nerves in the guinea pig eye derive from the trigeminal ganglion. Substance P (SP) also occurs in some ocular sensory neurons, suggesting the possible co-localization in this system of CCK- and SP-immunoreactivities. A double-labeling immunofluorescence technique stained 3 types of trigeminal cells and ocular nerve fibers: some immunoreactive for both peptides, some immunoreactive only for CCK and some immunoreactive only for SP.
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