内喉頭筋の機能 : 声門および声帯形態の変化に関して

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The purpose of the present study is to investigate how the position and the shape of the vocal cord are altered by contraction of the laryngeal muscles, and thus to determine the role of each laryngeal muscle in adjusting the vibrator, i. e. the vocal cord.In excised canine larynges, the changes in position and shape of the vocal cord when each muscle was electrically stimulated were observed and photographed from above as well as from the inner side. Then the larynges were rapidly immersed in cold alcohol solution of -30°C and fixed in the stimulated condition. They were dehydrated with u freeze substitution method, and later seved for histological examinations.The results obtained are the followings:1. Whe the the cricothyroid muscle is stimulated, the vocal cord is stretched, elongated and slightly adducted to paramedian position. The edge of the vocal cord becomes thin.2. Contraction of the posterior cricoarytenoid muscle results in abduction of the vocal cord to lateral position and the glottis is widely opened. The edge of the vocal cord becomes slightly thick, however, it becomes thin in the width of the entire vocal cord.3. Among the adductor muscles, there are significant differences in regulating shape of the vocal cord. When the thyroarytenoid muscle is stimulated, the vocal cord is markedly shortened and thickened and the middle part of the vocal cord is bulged. On the other hand, the cord is slightly elongated and becomes slightly thin at the edge when the lateral cricoarytenoid muscle is stimulated.4. On the histological examination of frontal section of the vocal cord, size and shape of the subepithelial layer, i. e. lamina propria is changed by contraction of each muscle.Contraction of the thyroarytenoid muscle results in an increase in cross sectional area whereas a decrease in the area results from contraction of the other three muscles.5. Contraction of the arytenoid muscle causes adduction of the arytenoid region, however, it does not affect shape of the membranous portion of the vccal cord markedly.6. From the findings described above, it appears that the laryngeal muscles play important roles to change the shape of the vocal cord, as well as to determine the position of the vocal cord.This gives us the bases to discuss laryngeal adjustments which produce different patterns of vocal cord vibration in various ways of phonation.
社団法人日本耳鼻咽喉科学会の論文

内喉頭筋の機能 : 声門および声帯形態の変化に関して

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