1992 Fiscal Year Final Research Report Summary
Motoneurons supplying the rabbit pharyngeal and palatal muscles
| Project/Area Number |
02670802
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Morphological basic dentistry
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| Research Institution | Osaka University |
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Principal Investigator |
KITAMURA Seiichiro Osaka University Faculty of Dentistry Associate Professor, 歯学部, 助教授 (30093404)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEMURA Motohide Osaka University Faculty of Dentistry Assistant, 歯学部, 助手 (70192169)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Pharyngeal constrictor muscles / Palatal muscles / Motoneurons / Localization / Nucleus ambiguus / Trigeminal motor nucleus / Vagus nerve / Rabbit |
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| Research Abstract |
1. Horseradish peroxidase or nuclear yellow was injected into each of the rabbit pharyngeal constritor muscles to localize motoneurons supplying them. The motoneurons were distributed in a subdivision of the nucleus ambiguus which had a compact cell arrangement and was located in the rostral half of the nucleus. We named that subdivision the compact cell group (CoG). They were confined in the dorsomedial portion of CoG at 0.5 to 2.9 mm rostral to the obex, in which the superior constrictor, middle constrictor, thyropharyngeal and cricopharyngeal motoneurons were arranged rostrocaudally in that order with a considerable overlap. 2. Horseradish peroxidase was injected into the tensor veli palatini muscle. The motoneurons were located in the rostral two-thirds of the trigeminal motor nucleus at 6.0 to 8.5 mm rostral to the obex, the location which was ventromedial to the dorsolateral subnucleus and also ventral to the ventromedial subnucleus. 3. Horseradish peroxidase was injected into the soft palate to localize the palatal motoneurons in the nucleus ambiguus. The motoneurons were located in CoG between obex and 1.9 mm rostrally, the location which continued caudally from the pharyngeal constrictor region with a partial overlap. One of the palatal muscles, the palatophryngeus, was supplied by the palatal region at 0.5 to 1.9 mm rostral to the obex. 4. Locations of neurons of origin of the glossopharyneal nerve, the branches of the vagus and the cranial root of the accessory nerve were studied with injections of horseradish peroxidase into the nerves or into both the palato-pharyngeal muscles and the inferior vagal ganglion with only the nerve of interest remaining intact. The results showed that the pharyngeal constrictor and palatal regions were occupied by neurons of origin of the vagal pharyngeal branch with a few neurons of origin of the superior laryngeal nerve scattered in the pharyngeal constrictor region.
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