AUTO-LARYNGOSCOPY. 



253 



(e.) Make the patient sing a deep or high note, or inspire 

 feebly or deeply, and observe the change in the shape of the 

 glottis. On uttering a deep note, the rings of the trachea 

 may be seen. N.B. Remember that what is seen by the 

 observer in the laryngeal mirror on his right or left corre- 



'S 



Fig. 117. View of the Fig. 118. Larynx during Vocal - 



Larynx during a Deep isation. ^/". i, fossa innominata; 



Inspiration. g.e,Glosso- h.f, hyoid fossa; com, ary- 



epiglottidean fold; l.c, tenoid commissure, 



lip and cushion of epi- 

 glottis ; a. e, ary-epio-lot- 

 tic fold; C.W, C.S, 

 cartilages of Wrisberg 

 and Santorini; v.c, vocal 

 cord; v.b, ventricular 

 band; p.v, processus 

 vocalis; c.r, cricoid car- 

 tilage; Brings of trachea. 



spends to the patient's left and right. The lower part of 

 the mirror gives an image of the more posterior structures, 

 while the anterior structures are reflected in its upper part. 



5. Auto-Laryngoscopy. The student should learn to use the 

 laryngoscope on himself. The student sits in a chair, fixes the 

 large reflecting mirror in a suitable holder about eighteen inches 

 in front of, and on a level with his mouth. Behind and to one side 

 of this an ordinary plane mirror is placed vertically. On one 

 side of his head he places the source of light. The light is 

 reflected on to the uvula by the reflecting mirror, and on intro- 

 ducing the small laryngeal mirror, by a little adjustment, one 

 sees the image of the larynx in the plane mirror. Or one may 

 use in a similar way the apparatus of Foulis. In Dr. George 

 Johnson's method, the ordinary reflector is strapped on to the 



