Vocal cord movements during sniff.

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Vocal cord movements during sniff were observed with a laryngo-fiberscope in 71 normal and 9 anosmic subjects. The vocal cords adducted during sniff in both groups. The mean duration of vocal cord movements during sniff was 0.52sec. in normal subjects, while 0.56sec. in anosmic subjects. When 0.05% naphazoline nitrate solution was sprayed suddenly into the opposite unanesthetized nasal cavity in 5 normal and 6 anosmic subjects, a glottic closure was observed in 2 out of the 5 normal subjects, and in 2 out of the 6 anosmic subjects. Laryngeal adductory movements during sniff were also observed in two subjects whose larynx, pharynx and both nasal cavities were anesthetized, and in one subject who was not anesthetized at all. No laryngeal adduction was observed when five normal subjects pinched their noses and attempted to inhale through the mouth as in sniffing. In addition to the experiments reported above, the nasal airflow rate was measured in 26 normal subjects during ordinary inspiration and sniff. Mean nasal flow rate at 1 cmH2O nasal resistance was 178ml/sec in inspiration and 143ml/sec in sniff. The ratio between sniff/inspiration was 0.81. The author concluded that the larynx has a significant relationship with olfaction.
一般社団法人日本耳鼻咽喉科学会の論文