RESPIRATORY DISCHARGE OF SOME VAGAL MOTONEURONS

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Abstract
A number of efferent recurrent laryngeal nerve fibers discharging in phase with inspiration were recorded in cats. These fibers conducted at 31.1-122 m/sec. at 37[degree]C and showed properties similar to phrenic motor fibers: their dishcarge increased during] inhalation of 6% CO2 in air or 10% O2 inN2; it was depressed by inhalation of 100% O2. Acute section of the vagosympathetic aortic and glossopharyngeal nerves did not change the CO2 response while pure oxygen became ineffective; 10% O2 became either ineffective or depressed the inspiratory units. Fewer units discharged in phase with expiration. CO2 depressed them while 10% O2 increased their discharge. Section of the buffer nerves did not change these responses. Inflation of the lungs depressed the inspiratory units an effect which was abolished by section of the vagi. No respiratory discharges could be recorded in the thoracic vagus below the point of emergence of the recurrent laryngeal nerve.

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