2005 Fiscal Year Final Research Report Summary
Analysis of brainstem neural networks related to laryngeal multifunctional activities
| Project/Area Number |
16390485
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Otorhinolaryngology
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| Research Institution | Chiba University |
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Principal Investigator |
SHIMOYAMA Ichiro Chiba University, Research Center for Frontier Medical Engineering, Professor, フロンティアメディカル工学研究開発センター, 教授 (60115483)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAZAWA Ken Chiba University, Graduate School of Medicine, Assistant Professor, 大学院・医学研究院, 講師 (10312943)
UMEZAKI Toshiro Kyushu University, University Hospital, Assistant Professor, 大学病院, 講師 (80223600)
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| Project Period (FY) |
2004 – 2005
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| Keywords | larynx / brainstem / respiratory neuron |
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| Research Abstract |
Respiration, as well as vocalization and upper airway defensive reflexes such as swallowing and coughing, is one of the important laryngeal functions. To determine the synaptic source of the respiratory-related activity of laryngeal motoneurons, spike-triggered averaging of the membrane potentials of laryngeal motoneurons was conducted using spikes of respiratory neurons located between the Botzinger complex and the rostral ventral respiratory group as triggers in decerebrate, paralyzed cats. We identified one excitatory and two inhibitory sources for inspiratory laryngeal motoneurons, and two inhibitory sources for expiratory laryngeal motoneurons. In inspiratory laryngeal motoneurons, monosynaptic excitatory postsynaptic potentials were evoked by spikes of inspiratory neurons with augmenting firing patterns, and monosynaptic inhibitory postsynaptic potentials (IPSPs) were evoked by spikes of expiratory neurons with decrementing firing patterns and by spikes of inspiratory neurons with decrementing firing patterns. In expiratory laryngeal motoneurons, monosynaptic IPSPs were evoked by spikes of inspiratory neurons with decrementing firing patterns and by spikes of expiratory neurons with augmenting firing patterns. We conclude that various synaptic inputs from respiratory neurons contribute to shaping the respiratory-related trajectory of membrane potential of laryngeal motoneurons.
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