[Stimulation of trigeminal receptors of the nasal mucosa by respiratory airflow]

Abstract

Afferent activity was recorded in the cat n. ethmoidalis. The impulse activity changed in nasal inspiration and less obviously in the first half of expiration. The modulations of afferent impulsation ceased with occlusion of nares in spite of the pressure increase in the nasal cavity. The suction of room air through nasal cavity from nares to nasopharynx induced a sustained increase of afferent activity. The suction of humid 40 degrees C air weakened the activity. Inverse relationships were observed between the air temperature and afferent activity within the range 24 degrees C to 40 degrees C. Changes of stimulation of the nose cavity mucose cold receptors seem to take place during respiration. No excitation of mechanoreceptors in breathing was revealed.