発話時における咽頭側壁の動態 : 鼻咽腔閉鎖機能を中心として
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概要
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The articulatory movements of the different parts of the pharyngeal wall, i. e., the lateral wall of the epipharynx and the mesopharynx, were investigated by means of endoscopical andelectromyographic technique.The horizontal movement pattern of the epipharyngeal wall and the vertical movement pattern of the velum showed striking similarity during speech production. Electromyography of the levator veli palatini muscle revealed well corresponding patterns of these two movements.From these observations, it can be concluded that velopharyngeal closure during speech is completed by combination of the velar elevation and medial displacement of the lateral wall of the epipharynx. Both of these two movements, even in different directions, are induced by the levator veli palatini muscle contraction.The next question was whether the movement pattern of the mesopharyngeal wall is the same as that of the epipharyngeal wall. In order to solve this question, movements of the lateral wall of the mesopharynx and the epipharynx were observed simultaneously with electromyographic recording from the levator veli palatini muscle and the superior constrictor muscle of the pharynx which might contribute to adduct the lateral wall of the mesopharynx. For open vowel /a/, the medial movement of the epipharyngeal wall was smaller than for high vowel /i/. On the contrary, the medial excursion of the mesopharyngeal wall was greater for /a/ production than /i/production. Electromyography of the superior constrictor muscle showed greater activity level for /a/ than for /i/, which was opposite to the levator veli palatini muscle activity pattern.This observed evidence indicates that the mesopharyngeal wall movement during speech production is caused by the superior constrictor muscle and has some effects on vowel articulation, whereas epipharyngeal wall adducts to complete the velopharyngeal closure.
- 社団法人 日本耳鼻咽喉科学会の論文