Olfactory-hypoglossal connections

Natural olfactory stimulation with amyl acetate significantly modulates the electrical activity of hypoglossal neurons and the electromyographic responses of the tongue musculature. The aim of the present study was to identify and characterize, using neuroanatomical and neurophysiological approaches...

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Bibliographic Details
Published in:Pflügers Archiv 2003-03, Vol.445 (6), p.705-715
Main Authors: Mameli, Ombretta, Russo, Antonella, Borke, Rosemary, Melis, Francesco, Caria, Marcello Alessandro, Pellitteri, Rosaria, Tavera, Claudio, Stanzani, Stefania
Format: Article
Language:English
Subjects:
Animals
Biotin - analogs & derivatives
Dextrans
Electrophysiology
Fluorescent Dyes
Habenula - cytology
Habenula - physiology
Hypoglossal Nerve - cytology
Hypoglossal Nerve - physiology
Male
Olfactory Bulb - cytology
Olfactory Bulb - physiology
Olfactory Pathways - cytology
Olfactory Pathways - physiology
Raphe Nuclei - cytology
Raphe Nuclei - physiology
Rats
Rats, Wistar
Septal Nuclei - cytology
Septal Nuclei - physiology
Stilbamidines
Tongue - physiology
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Summary:Natural olfactory stimulation with amyl acetate significantly modulates the electrical activity of hypoglossal neurons and the electromyographic responses of the tongue musculature. The aim of the present study was to identify and characterize, using neuroanatomical and neurophysiological approaches, the pathways involved in the transmission of the olfactory information to the hypoglossal nucleus (XIIn). The neuroanatomical findings provided the initial demonstration that olfactory information is conveyed from the olfactory bulb to the hypoglossal nucleus via the interpeduncular nucleus (IPn) by both fast disynaptic and different polysynaptic pathways. The latter, in particular, involve many of the brain structures that process olfactory information. The electrophysiological studies demonstrated that the IPn neurons respond with a variety of patterns to natural stimulation of the olfactory receptors, thus supporting the hypothesis that the IPn is a crucial relay station for the elaboration and transmission of olfactory stimuli to XIIn.
ISSN:0031-6768
1432-2013
DOI:10.1007/s00424-002-0977-8