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J Neurophysiol 87: 1703-1711, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 87 No. 4 April 2002, pp. 1703-1711
Copyright ©2002 by the American Physiological Society

Discharge Patterns of Hypoglossal Motoneurons During Fictive Breathing, Coughing, and Swallowing

Fabrice Roda, Christian Gestreau, and Armand Louis Bianchi

Laboratoire de Neurobiologie des Fonctions Végétatives, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, Faculté des Sciences et Techniques Saint Jérôme, 13397 Marseille Cedex 20, France

Roda, Fabrice, Christian Gestreau, and Armand Louis Bianchi. Discharge Patterns of Hypoglossal Motoneurons During Fictive Breathing, Coughing, and Swallowing. J. Neurophysiol. 87: 1703-1711, 2002. We performed a series of experiments to study the intracellular activity of 58 hypoglossal motoneurons (HMs) in decerebrate, paralyzed, and ventilated cats. Changes in membrane potentials (MP) and discharge activities were evaluated during fictive breathing (FB), swallowing (FS), and coughing (FC). FS and FC were elicited by electrical stimulation of the superior laryngeal nerves. FB, FS, and FC all exhibited characteristic discharge patterns of the phrenic, abdominal, pharyngeal branch of the vagus, and hypoglossal nerves. Thirty-nine HMs displayed respiratory modulation, and 19 were nonrespiratory modulated. Nine HMs did not exhibit MP changes during FB, FS, and FC. During FS, 49 HMs exhibited MP changes consisting of depolarization, hyperpolarization or hyperpolarization-depolarization. HMs involved in FS were either respiratory modulated (n = 38) or not (n = 11). Only 20 HMs displayed MP changes and/or discharge activity during FC. All but two HMs fired during the expiratory phase of FC or at the end of this reflex. All HMs involved in FC (n = 20) were also modulated during both FB and FS. Our results suggest that the XII nucleus is functionally divided into common and distinct subsets of HMs based on their spontaneous activities and responses observed during FS and FC. The changes in MP and discharge frequencies observed during the three behaviors also suggest that HMs are driven by specific premotor neurons during FS, whereas a common premotor pathway is involved during FB and FC.




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W. M St.-John, J. F. R Paton, and J. C Leiter
Uncoupling of rhythmic hypoglossal from phrenic activity in the rat
Exp Physiol, November 1, 2004; 89(6): 727 - 737.
[Abstract] [Full Text] [PDF]


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