. Kirkes' handbook of physiology . sound is produced at the posterior part of the apertureof the glottis, the part of the aperture which is formed by the space betweenthe arytenoid cartilages. For if the arytenoid cartilages be approximated insuch a manner that their anterior processes touch each other, but yet leave anopening behind them as well as in front, no second vocal tone is produced bythe passage of the air through the posterior opening, but merely a rustlingsound. The pitch of the note produced is the same whether the posteriorpart of the glottis be open or not. The Voice in Singing.
. Kirkes' handbook of physiology . sound is produced at the posterior part of the apertureof the glottis, the part of the aperture which is formed by the space betweenthe arytenoid cartilages. For if the arytenoid cartilages be approximated insuch a manner that their anterior processes touch each other, but yet leave anopening behind them as well as in front, no second vocal tone is produced bythe passage of the air through the posterior opening, but merely a rustlingsound. The pitch of the note produced is the same whether the posteriorpart of the glottis be open or not. The Voice in Singing. The laryngeal votes may be produced ifi threedifferent kinds of sequence. The first is the monotonous, in which the noteshave nearly all the same pitch as in ordinary speaking; the variety of the soundsof speech being due to articulation in the mouth. In speaking, occasionalsyllables receive a higher intonation for the sake of accent. The second modeof sequence is the successive transition from high to low notes, and vice versa,. Fig. 349.—View of the Upper Part of the Larynx as Seen by Means of the Laryngoscopeduring the utterance of a grave note, c. Epiglottis; s, tubercles of the cartilages of Santorini; a,arytenoid cartilages; z, base of the tongue; pit, the posterior wall of the pharynx. (Czermak.) without intervals; such as is heard in the crying in children and in the howlingand whining of dogs. The third mode of sequence of the vocal sounds is themusical, in which each sound has a determinate number of vibrations, and thenumbers of the vibrations in the successive sounds have the same relativeproportions that characterize the notes of the musical scale. The different sounds made by the musical voice are characterized by thethree properties of tones in general, viz., the pitch, which is dependent on therate of vibration of the vocal cords; the loudness, which depends on the force ofthe vibration, and the quality or timber, which is dependent on the resonance ofthe cav
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