Carpenter's principles of human physiology . ytenoidcartilages becoming elevated and rapidly approaching one another untilthey come almost into complete contact, whilstthey bend under the border of the depressedepiglottis in such a manner that the latter, asviewed by the laryngoscope, entirely conceals theinterior of the Larynx. According to Mandl*the opening of the glottis in the production ofthe deepest notes is ellipsoidal. During theemission of the most acute sounds, the Glottisis contracted in a linear form (Fig. 306); oneach side we perceive the vocal cords, dis-tinguished by their whiti
Carpenter's principles of human physiology . ytenoidcartilages becoming elevated and rapidly approaching one another untilthey come almost into complete contact, whilstthey bend under the border of the depressedepiglottis in such a manner that the latter, asviewed by the laryngoscope, entirely conceals theinterior of the Larynx. According to Mandl*the opening of the glottis in the production ofthe deepest notes is ellipsoidal. During theemission of the most acute sounds, the Glottisis contracted in a linear form (Fig. 306); oneach side we perceive the vocal cords, dis-tinguished by their whitish-yellow colour, and alittle to the outer side is a narrow groove indi-cating the position of the ventricles of false or superior vocal cords. These parts, with the erected arytenoid carti-lages, the epiglottis pulled upwards and forwards, and the aryteno-epiglottidianligaments, together form a short and stiff tuhe situated above the Glottis; thewhole appearing, from the sensation we experience during the experiment, Fig. Condition of the Larynx during theemission of a high or acute sound : e,epiglottis; cu, cushion of epiglottis;i o c, true vocal cord ; s v c, false vocalcord. Further outwards again are * Wien Acad. , Band lxii. p. 764; and Traite Pratique des Maladies du Larynxet du Pharynx, Paris, 1872. 832 OF THE VOICE AND SPEECH. to be in a state of very great tension.* That the aperture of the glottis isgreatly narrowed during the production of sounds, is easily made evident toones-self, by comparing the time occupied by an ordinary expiration, withthat required, for the passage of the same quantity of air during the suste-nance of a vocal tone. Further, the size of the aperture is made to vary inaccordance with the note which is being produced ; of this, too, any one mayconvince himself, by comparing the times during which he can hold out alow and a high note ; from which it will appear that the aperture of theglottis is so much narrowed in
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
