Functional peculiarities of fish trigeminal system

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Abstract
Functional properties of trigeminal nerve of White Sea cod ( Gradus morchua maris-albi ) and fresh-water carp ( Cyprinus carpio ) were studied by recording the electrical activity of single nerve fibers. The trigeminal nerves were found to be sensitive to mechanical, thermal, and chemical stimuli. The threshold concentrations were estimated for a number of chemical agents and response specificities were revealed for individual nerve fibers. Mono- and polymodal units were distinguished among fibers. The activity of trigeminal efferent fibers was studied using chemical and electrical stimulation of the olfactory system. The trigeminal and olfactory systems were shown to be functionally interrelated at the level of their central formations. Ecological and evolutionary aspects of fish chemoreception were discussed.

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