The trigeminal nerve is the fifth, very sensitive cranial nerve of the facial skull. It owes its name to the fact that it is divided into three main branches, one of which also has olfactory functions. It conveys tactile (concerning the sense of touch) sensations of the facial region, which are perceived on the mucous membranes of the oral cavity and the nose when drinking wine or alcohol. These are irritative sensations of a physical rather than chemical nature. The trigeminal stimuli are a partial aspect of haptic perception. They are not typical olfactory or gustatory sens ations, although the effects are relatively strongly involved in the overall impression.
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