File:Kirkes' handbook of physiology (1907) (14583434437).jpg

Identifier: kirkeshandbookof00kirk (find matches)
Title: Kirkes' handbook of physiology
Year: 1907 (1900s)
Authors: Kirkes, William Senhouse, 1823-1864 Greene, Charles Wilson, 1866-1947
Subjects: Physiology
Publisher: New York, W. Wood and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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thetenser do the cords become, figure 348, A; and the range of a voice depends, ofcourse, in the main, on the extent to which the degree of tension of the vocalcords can be thus altered. In the production of a high note the vocal cordsare brought well within sight, so as to be plainly visible with the help of thelaryngoscope. In the utterance of low tones, on the other hand, the epiglottis MOVEMENTS OF THE VOCAL CORDS 487 is depressed and brought over the vocal cords, figure 349. The epiglottis,by being somewhat pressed down so as to cover the superior cavity of the lar-ynx, serves to render the notes deeper in tone and at the same time somewhatduller, just as covering the end of a short tube placed in front of caoutchouctongues lowers the tone. In no other respect does the epiglottis appear to haveany effect in modifying the vocal sounds. The degree of approximation of the vocal cords also usually correspondswith the height of the note produced; but probably not always, for the width
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Fir,. 348.—Three Laryngoscopic Views of the Superior Aperture of the Larynx and SurroundingParts. A, The glottis during the emission of a high note in singing; B, in easy and quiet inhalationof air; C, in the state of the widest possible dilatation, as in inhaling a very deep breath. Thediagrams A, B. and C, show in horizontal sections of the glottis the position of the vocal ligamentsand arytenoid cartilages in the three several states represented in the other figures. In all thefigures, so far as marked, the letters indicate the parts as follows, viz.: /, the base of the tongue;e, the upper free part of the epiglottis; e, the tubercle or cushion of the epiglottis; ph, part of theanterior wall of the pharynx behind the larynx; in the margin of the aryteno-epiglottidean foldw, the swelling of the membrane caused by the cartilages of Wrisberg; s, that of the cartilagesof Santorini; a, the tip or summit of the arytenoi 1 cartilages; cv, the true vocal cords or lips ofthe rima glottidi

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