Anatomy, physiology and hygiene . ytenoid cartilages. 1 An oval or round mirror attached to ;i long handle, which, placed inthe back and upper pari of the throat, reflects the interior oi the Larynx, and, under favorable conditions, a part of the trachea. This instrument 368 THE VOICE. of voice. An examination of the interior of the larynxwith this instrument during ordinary respiration showsthe chink of the glottis to be quite wide during in-spiration, but much narrowerduring expiration; for in thelatter case the muscles of thelarynx are passive, air beinggently forced out. During vo-calizati
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Anatomy, physiology and hygiene . ytenoid cartilages. 1 An oval or round mirror attached to ;i long handle, which, placed inthe back and upper pari of the throat, reflects the interior oi the Larynx, and, under favorable conditions, a part of the trachea. This instrument 368 THE VOICE. of voice. An examination of the interior of the larynxwith this instrument during ordinary respiration showsthe chink of the glottis to be quite wide during in-spiration, but much narrowerduring expiration; for in thelatter case the muscles of thelarynx are passive, air beinggently forced out. During vo-calization the vocal cords areparticularly well defined. Speechis shown to be effected duringexpiration only, though harshsounds may be formed during in-spiration. As soon as an attemptis made to produce a sound, thecords are thrown into action. In the production of highmusical notes or shrill sounds, they are made tense andare closely approximated, and are relaxed and moved fur-ther apart during the emission of sounds opposite to these.. Fig. 113. View of the interior of the larynxduring respiration. Kings ofthe trachea seen through thelaryngeal opening, the vocalcords (represented in white)being apart. 398. For the production of clearvocal sound, the cords must bebrought into close approximationand must be capable of easy vibra-tion. If they cannot so approacheach other, whispering results.If they are not sufficiently smoothor straight, or if their action isirregular, or if they have on their