喉頭蓋の形態と呼吸気流に関する流れ学的研究
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概要
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A. Morphological StudiesRegarding to shapes of the epiglottis of the human larynx, they were classified into four types; infantile, arc, roof and omega types. At every part of 74 epiglottis, measurements of their sizes were performed.The results were as follows:-1. Concerning the length of the major axis of the epiglottis and its surface area facing to the larynx, significant differences were not observed among these types except the infantile type.2. Area of the upper part of the epiglottis projected on the plane identical with the upper surface of the vocal cords, and the angle formed by the epiglottis and a forementioned plane were larger in the types of roof and arc than that of the omega and infantile types.3. The angle between the epiglottis and the frontal plane vertical to the upper surface of the vocal cords was the largest in the infantile type and in the order of omega, roof and arc types it was gradually decreased.B. Aero-Hydrodynamical StudiesAero-hydrodynamical meaning of the epiglottis-shape was studied experimentally by using cadavers epiglottis or epiglottis, models in the smoke or water flow.1. During expiration, the flow passing through the larynx converged to the center of the laryngeal lumen in the case of the omega type.2. During inspiration, amount of the reverse flow at the lingual side of the epiglottis was estimated smaller in the case of arc and omega types than in the other types.3. By the epiglottis inspiratory air flow changes its direction as if there is a jump stages gliding down snow-covered inclines on skis.
- 社団法人 日本耳鼻咽喉科学会の論文