File:Education of Deaf-Mutes - A Manual for Teachers (1888) (14777629004).jpg

Identifier: educationofdeafm00thom (find matches)
Title: Education of Deaf-Mutes : A Manual for Teachers
Year: 1888 (1880s)
Authors: Thomas Arnold
Subjects: Education
Publisher: Wertheimer, Lea & Co.
Contributing Library: American Printing House for the Blind, Inc., M. C. Migel Library
Digitizing Sponsor: American Printing House for the Blind, Inc.

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) running downwardsand inwards from their attachment to the outer part of thebases of the arytenoids over the posterior surface of the cricoid. The two ligaments (Fig. 11, g) connecting the arytenoidswith the cricoid cartilage, complete the general view of thesection as seen from above. The actions of the interior muscles of the larynx may be. / briefly summed up thus :jK. The general action of the thyro-arytenoids is to draw the/ arytenoid cartilages more forward, and so relax the vocalchords. Fig. 13.—Teaxsverse Yeetical Section of the Laeynx neae itsMiddle, viewed feom Behind, epiglottis ; e, its cushion ; //, greathorn of the hyoid bone, left side; /, thyro-hyoid membrane; a, thyro-arytenoid muscle; d, thyroid; c, cricoid ; g, g, the false vocal chords;sr. x, the ventricles ; the one on the right shows the pouch, 0, more openedby carrying the section further forward; h, the right inferior thyro-arytenoid ligament in the membrane of the true vocal chord at the rima ofthe glottis.
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Ti^. 13. OF DEAF-MUTES. 181 The lateral crico-arytenoids rotate these cartilages in sucha manner as to cause the vocal processes to approach oneanother and so to narrow the slit. The posterior crico-arytenoids rotate them in the oppositedirection, and so widen the slit. The transverse arytenoid draws the back of the arytenaidstogether, with the effect of widening, to a certain extent, thefront half of the slit, and at the same time depressing theglottis. 68. The practical object sought by this detailed descrip-tion of the glottis, is to give the student not only clearconceptions of its action on speech, but also to enable himto apply his knowledge to this special work. Muscularaction is a form of motion, and this in the glottis is per-ceptible by touch. We can not only feel the vibrations ofthe glottis in vowel sounds, but the action of the musclesin raising or depressing the whole larynx. The actionof the crico-thyroid muscle is also itself perceptible if weplace the fourth finger on

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