A manual of diseases of the nose and throat . he voice insuch cases is seldom better than a loud whisper. Thefunction of the larynx in deglutition lies mainly in itsbeing drawn up under the base of the tongue, out ofthe way of the bolus of food. At the same time,owing to contraction of the ary-epiglottic muscle, theentrance to the larynx is markedly diminished. Theepiglottis is folded down so as partially to shield theentrance to the larynx. It does not prevent the en-trance of food into this canal, as once believed, for ithas been completely destroyed by disease without anygreater tendency of
A manual of diseases of the nose and throat . he voice insuch cases is seldom better than a loud whisper. Thefunction of the larynx in deglutition lies mainly in itsbeing drawn up under the base of the tongue, out ofthe way of the bolus of food. At the same time,owing to contraction of the ary-epiglottic muscle, theentrance to the larynx is markedly diminished. Theepiglottis is folded down so as partially to shield theentrance to the larynx. It does not prevent the en-trance of food into this canal, as once believed, for ithas been completely destroyed by disease without anygreater tendency of the food to enter the larynx thanbefore. CHAPTER III. EXAMINATION OF THE UPPER RESPIRATORY TRACT. With the exception of the mouth, which may beexamined by means of direct illumination, the exam-ination of the upper respiratory tract must be made bymeans of light reflected from a mirror. The source of illumination may be sunlight or someform of artificial illumination. As sunlight is notalways available, artificial light is usually Mackenzie condenser. The naked flame of an Argand burner, using eithergas or oil, or, better, an Argand burner provided witha Mackenzie condenser (Fig. 5), is the most commonsource of illumination. The Welsbach hood with a 39 40 EXAMINATION OF UPPER RESPIRATORY TRACT. Fig. 6.
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