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Hypoglossal nuclei participation in rat mystacial pad control

Becciu, Chiara Ombretta and Stanzani, Stefania and Russo, Antonella and Romeo, Rosa and Pellitteri, Rosalia and Spatuzza, Michela and Caria, Marcello Alessandro and De Riu, Pier Luigi (2008) Hypoglossal nuclei participation in rat mystacial pad control. Pflügers Archiv. European Journal of Physiology, Vol. 456 (6), p. 1189-1198. eISSN 1432-2013. Article.

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DOI: 10.1007/s00424-008-0472-y


Recently, we showed that extra-trigeminal axons, originating from the hypoglossal nucleus, travel with the infraorbital division of the trigeminal nerve (ION), which is known to innervate the rat mystacial pad. Dil was monolaterally injected into the rat XII nucleus to analyse the peripheral distribution of hypoglossal axons to the mystacial pad, to evaluate their involvement in facial sensory–motor control. Electromyographic responses of mystacial pad motor units to electrical stimulation of the ION were recorded, along with the evoked responses to electrical stimulation of the ipsilateral XII nucleus. The results showed that hypoglossal axon terminals target the ipsilateral extrinsic musculature of the mystacial pad, but they do not have any contact with the intrinsic muscles. ION electrical stimulation increased electromyographic activity in the ipsilateral pad extrinsic muscles, even following VII nerve transection. Hypoglossal nucleus electrical stimulation induced field potentials and monosynaptic responses in the same motor units that persisted even following VII nerve transection, these disappearing after cooling the ION. We suggest that the small hypoglossal neurons projecting to the extrinsic musculature of the mystacial pad are part of a hypoglossal–trigeminal loop that participates in the sensory–motor control of the rat vibrissae system.

Item Type:Article
ID Code:4080
Uncontrolled Keywords:Electromyography, evoked responses, extrinsic pad musculature, hypoglossal nucleus, hypoglossal terminals, infraorbital nerve, rat
Subjects:Area 05 - Scienze biologiche > BIO/09 Fisiologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze biomediche
Publisher:Springer Berlin / Heildelberg
Deposited On:01 Jul 2010 10:43

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