Distributions of Serotonin and Substance P Fibers within the Nucleus Ambiguus of the Cat
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概要
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Serotonin (5-HT) and substance P (SP) fibers are known to be distributed in the nucleus ambiguus (NA). In this study, retrograde tracing and immunohistochemistry methods were used to compare the distribution of the 5-HT and SP with the location of the laryngeal motoneuron pools innervating the posterior cricoarytenoid (PCA), the thyroarytenoid (TA), and the lateral cricoarytenoid (LCA) muscles.<BR>The PCA pool was located in the ventral part of the NA; the LCA and TA pool was located in the dorsal part of the NA. The density of 5-HT immunoreactive fibers and varicosities was higher in the ventral part of the NA, where the PCA motoneuron pool is located, than in the dorsal part of the NA. The density and pattern of distribution of SP immunoreactive fibers and varicosities were similar to those of the 5-HT immunoreactive fibers and varicosities. The present results, that the patterns of 5-HT and SP innervation vary according to the type of motoneurons and their projections to the larynx, suggest that these putative neurotransmitters may be more involved in influencing the activity of the abductor than that of the adductor of the vocal cords.
- The Japan Laryngological Associationの論文
The Japan Laryngological Association | 論文
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