Education of Deaf-Mutes : A Manual for Teachers . earand speak have been unconsciously using their forces sincethey pronounced their first word, so that their muscles andlungs are highly developed. Deaf-mutes use them only for Fig. 7—View of the Cartilages op the Laeynx from behind.(Figs. 7 to 12 are the natural size.) a, a, arytenoid cartilages ; at theirtip3° above, the cornicula or cartilages of Santorini; /, muscular processof the left arytenoid ; c, cricoid cartilage ; tJi, thyroid cartilage ; h, itsupper, d, its lower horn ; c, epiglottis ; h, ligament connecting the lowerhorn of the thy
Education of Deaf-Mutes : A Manual for Teachers . earand speak have been unconsciously using their forces sincethey pronounced their first word, so that their muscles andlungs are highly developed. Deaf-mutes use them only for Fig. 7—View of the Cartilages op the Laeynx from behind.(Figs. 7 to 12 are the natural size.) a, a, arytenoid cartilages ; at theirtip3° above, the cornicula or cartilages of Santorini; /, muscular processof the left arytenoid ; c, cricoid cartilage ; tJi, thyroid cartilage ; h, itsupper, d, its lower horn ; c, epiglottis ; h, ligament connecting the lowerhorn of the thyroid with the cricoid. 8.—External View of the Right Side of the , hyoid bone ; h, its small, c, its great horn or cornu ; d, thyro-hyoidligament; e, upper horn of thyroid ; /, posterior crico-arytenoid muscle,partly hidden by the thyroid ; g, crico-thyroid muscle, attached below to7l, the anterior part of the cricoid ; /, right wing or ala of the thyroid;above g, between it and the thyroid, is seen the crico-thyroid Ftjr. S. ? OF DEAF-MUTES. 175 vital respiration, and their action is therefore limited toits necessities ; but speech requires much more in volume,muscular force and facility for its free production. Thismust at first be produced artificially. Let then respirationbe increased by muscular action till every utterance sharesin the effect. Organs of Speech. (^4. The Larynx is a continuation of the tube formed bythe trachea, but differing in structure, on account of the uses it has to serve. Like a chest it has a framework openabove and below, and the shell is of cartilage and bones, towhich the muscles employed in phonation are attached(Fig. 12). These cartilages are, the cricoid, thyroid, andarytenoids, with the hyoid bone. The Cricoid Cartilage is situated immediately abovethe uppermost ring of the trachea (Fig. 12, Jc), itself a largerand deeper ring, narrow in front but gradually wideningtowards the rear till it terminates in
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