The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . mp, placed at the side of the patients head, to throwlight on the large mirror, m ; m, a small mirror held in the back of thethroat of the patient : e, epiglottis ; v c, location of the vocal cords. RESPIRATION. 127 \ to the tension of the vocal cords. This is well illus-trated by referring to Figs. 37 and 38. During inspira-tion the vocal cords are quiet, and the opening betweenthem is large, as in Fig. 37; but when sounds are pro-duced the vocal cords come together and the glottis is narrowed. The h
The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . mp, placed at the side of the patients head, to throwlight on the large mirror, m ; m, a small mirror held in the back of thethroat of the patient : e, epiglottis ; v c, location of the vocal cords. RESPIRATION. 127 \ to the tension of the vocal cords. This is well illus-trated by referring to Figs. 37 and 38. During inspira-tion the vocal cords are quiet, and the opening betweenthem is large, as in Fig. 37; but when sounds are pro-duced the vocal cords come together and the glottis is narrowed. The higher , ,. ^ ... , the notes, so much the -^M^ ^*i tighter will the vocal ^ *-* *—«h cords be drawn, and somuch the narrowerwill be the glottis, asin Fig. 38. Figs. 37and 38 are representa-tions of the interior ofthe larynx, as seenwith the laryngoscope. The laryngoscopeconsists of a small mir-ror attached to a longhandle. To use it, themouth is opened, thetongue drawn forward,and the mirror intro-duced as shown inFig. 39. Direct sun-light, or artificial light,is reflected from a large. Fig. 40. A diagram illustrating theposition and use of the epiglottis : N, na-sal passages ; M, mouth ; o, oesophagus;L, larynx ; T, tongue; the feathered ar-rows represent the passage for air ; theplain arrows, the passage for food. mirror to the smaller one which is in the back part ofthe throat. The small mirror reflects the light downthe larynx so that its interior becomes brilliantly illu-minated. A picture of the larynx is thus formed in themirror, to which the observer directs his eye. 128 THE ESSENTIALS OF HEALTH. The Epiglottis. The entrance to the larynx is pro-tected by a valve, or lid, called the epiglottis. Duringrespiration the epiglottis is directed upward, so thatthe larynx is open; but during the act of swallowing,the epiglottis shuts tightly down over the larynx, pre-venting the entrance of any solid or liquid. Occasion-ally, however, a particle of food goes the wrong way an
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
