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首页> 外文期刊>Journal of Neurophysiology >Modulation of the inspiratory-related activity of hypoglossal premotor neurons during ingestion and rejection in the decerebrate cat.
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Modulation of the inspiratory-related activity of hypoglossal premotor neurons during ingestion and rejection in the decerebrate cat.

机译：在小脑猫的摄入和排斥过程中调节舌下运动前神经元的吸气相关活性。

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Single-unit activities of the bulbar reticular inspiratory neurons directly projecting to hypoglossal motoneurons were studied during fictive ingestion (e.g., swallowing) and rejection elicited by repetitive stimulation of the superior laryngeal nerve and by application of water to the pharynx in immobilized decerebrated cats. The single-unit activity was recorded during 113 episodes of fictive ingestion from 25 inspiratory neurons directly projecting to hypoglossal motoneurons (single projection neurons) and 7 inspiratory neurons directly projecting to both hypoglossal and phrenic motoneurons (dual projection neurons) in the regions ventrolateral to the nucleus tractus solitarii and dorsomedial to the nucleus ambiguus. All of single projection neurons ceased inspiratory-related rhythmical discharges coincidentally with the onset of repetitive stimulation of the superior laryngeal nerve. The majority of them (19/25, 76%, type A) showed a spike burst during ingestion, whereas the minority (6/25, 24%, type B) kept silent until the end of repetitive stimulation of the superior laryngeal nerve. During fictive ingestion elicited by application of water to the pharynx, the type-A neurons showed a spike burst activity, whereas the type-B neurons kept silent. All dual projection neurons (7/7, 100%, type C) ceased inspiratory-related rhythmical discharges at the onset of repetitive stimulation of the superior laryngeal nerve and showed no activity during fictive ingestion. Likewise, the type-C neurons kept silent during fictive ingestion elicited by application of water to the pharynx. A spike burst was induced during 33 episodes of fictive rejection in all of 5 tested type-A, 3 tested type-B, and 6 tested type-C neurons. It is concluded that the premotor neurons involved in the respiratory-related rhythmical activity of hypoglossal motoneurons is responsible for switching from respiration to ingestion and rejection.
机译：在虚构的摄取（例如吞咽）和重复刺激喉上神经并向固定的去脑猫的咽部加水引起的排斥反应期间，研究了直接投射到舌下运动神经元的球状网状吸气神经元的单单位活动。在单元格腹侧腹侧区域的25个直接投射到舌下运动神经元（单个投射神经元）的吸气神经元和7个直接投射到舌下运动神经元和运动神经元（双投射神经元）的吸气神经元的113次虚构摄食期间记录了单单元活动。孤束核和背核到歧核。所有的单个投射神经元都停止了与吸气有关的节律性放电，这恰恰是重复刺激上喉神经的发作。他们中的大多数（19 / 25，76％，A型）在摄入过程中出现尖峰爆发，而少数（6 / 25，24％，B型）保持沉默，直到重复刺激喉上神经结束。在向咽部加水引起的虚构摄取期间，A型神经元显示出突波爆发活动，而B型神经元保持沉默。在重复刺激喉上神经开始时，所有双投射神经元（7 / 7，100％，C型）均停止了与吸气有关的节律性放电，并且在虚构吞咽过程中未显示任何活动。同样，在向咽部加水引起的虚构摄入过程中，C型神经元保持沉默。在5个测试的A型神经元，3个测试的B型神经元和6个测试的C型神经元中，在33次虚构排斥反应中诱发了尖峰爆发。结论是，参与舌下运动神经元的呼吸相关节律活动的运动前神经元负责从呼吸转换为摄入和排斥。

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