. A text-book of human physiology . Fig. 200.—Schematic representation of tlieaction of the posterior crico-arytenoidmuscles, after Testut. Tlie red colorindicates the position of the vocalcords and of the arytenoid cartilages,when these muscles Fig. 201.—Sth(--inatic representation ofthe action of the lateral crico-aryte-noid muscle, after Testut. The redcolor indicates the position of the vocalcords and of the arytenoid cartilageswhen these muscles contract. the vocal cords by approximating the points of their attachment. But a muchmore important function is to impart the necessar
. A text-book of human physiology . Fig. 200.—Schematic representation of tlieaction of the posterior crico-arytenoidmuscles, after Testut. Tlie red colorindicates the position of the vocalcords and of the arytenoid cartilages,when these muscles Fig. 201.—Sth(--inatic representation ofthe action of the lateral crico-aryte-noid muscle, after Testut. The redcolor indicates the position of the vocalcords and of the arytenoid cartilageswhen these muscles contract. the vocal cords by approximating the points of their attachment. But a muchmore important function is to impart the necessary internal tension and firm-ness, as well as to give a favorable form and position to the whole mass ofthe vocal cord, for intonation (Griitzner). 504 HEARING, VOICE AND SPEECH With the exception of the crico-thyroid muscle which is innervated hy thesuperior and median lar3ngeals, the latter arising from the phar^-ngeal branchof the vagus, the muscles of the larynx receive their nerve supply from therecurrent laryngeal. § 2. VOICE PRODUCTION Production of sound in the larynx presupposes that the glottis is closedand that the vocal cords are placed in a state of tension. If then air isdriven from the lungs under sufficient pressure, it forces its
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiology, bookyear1
