The lacrimal nerve, a branch of the trigeminal, is mainly a sensory nerve but it also conveys parasympathetic and probably sympathetic fibres to the lacrimal gland The role of these autonomic fibres in controlling lacrimal secretion is not clear. Stimulation of the lacrimal nerve in dogs was found by Tepliachine (1894) to cause an increase in lacrimal secretion. In contrast, stimulation of the cervical sympathetic nerves produced variable effects on lacrimal secretion in man and animals
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ELSBY et al. (1967) studied this question.
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