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Localization of motoneurons innervating the stylopharyngeus muscle in the cat |
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| Authors: | H van Loveren M C Saunders P Cassini J T Keller |
| Affiliation: | 1. James N. Gamble Institute of Medical Research, Cincinnati, OH U.S.A.;2. Department of Neurosurgery, The Christ Hospital, Cincinnati, OH U.S.A.;3. Department of Neurosurgery, College of Medicine, University of Cincinnati, Cincinnati, OH U.S.A.;4. Department of Anatomy and Cell Biology, College of Medicine, University of Cincinnati, Cincinnati, OH U.S.A.;5. Mayfield Neurological Institute, Cincinnati, OH U.S.A. |
| Abstract: | Recent investigations of the nucleus ambiguus (NA) have attempted to identify motoneurons associated with muscles of the larynx and pharynx. However, relatively little attention has been directed to the stylopharyngeus muscle, which is important in elevation of the pharynx in swallowing and speech. The present study was designed to identify the specific location of stylopharyngeus motoneurons within the brainstem. Horseradish peroxidase or fluorescent dye was injected into the stylopharyngeus muscle of 12 cats. Retrogradely labeled cells were located ipsilateral in the rostral NA and retrofacial nucleus. This is the first report to definitively localize stylopharyngeus motoneurons. |
| Keywords: | stylopharyngeus muscle motoneuron nucleus ambiguus retrofacial nucleus horseradish peroxidase cat |
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