人および犬声帯の構造とスチッフネス

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Structure and stiffness of the human and the canine vocal cords were studied. Light microscopic observation showed that the both vocal cords are not uniform in its structure but should be regarded as, at least, a double-layered vibrator which consists of a body and a cover. Load-elongation relationships of the cover and the body as well as the entire vocal cord were measured for the specimen sliced in a frontal section of an excised fresh vocal cord. The elongation caused by loading at the tip of the edge was measured by using a measuring microscope. The strain for the cover was much greater than that of the body. The ratio of the strain for the cover to that of the body was approximately 6:1 for the canine vocal cord. In the case of the human vocal cord the ratio of the strain for the cover to that of the transition layer to that of the body was approximately 10:8:1. Changes in stiffness of the entire vocal cord caused by the contraction of the cricothyroid muscle and the vocalis muscle were investigated for excised hemilarynges. The load and elongation were automatically recorded by using a force-transducer and a linear variable differential transformer. When the cricothyroid contraction was stimulated,the stiffness was increased as ar esult of the longitudinal stretching of the vocal cord. When the vocalis muscle was activated, the stiffness was rather decreased for smaller loads, especially in vertical direction, because the cover was slackened. For greater loads, however, the stiffness was increased expectedly by the stiffening of the body under stimulation.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文

人および犬声帯の構造とスチッフネス

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