82 



EXERCISE XIII 



Obs. 62. 

 Phagetic 

 efficacy of 

 water, dilute 

 alcohol, and oil. 



Obs. 63. 

 Eeflex closure 

 of glottis J 

 cough. 



Obs. 64. 

 Beflex swal- 

 lowing by 

 stimulation 

 of superior 

 laryngeal 

 nerve. 



Slit soft palate sagittally in middle line nearly back to its posterior 

 edge. With a moistened small camel-hair brush press against the roof 

 or top of posterior wall of pharynx, 

 imitating pressure of a bolus. Swallowing 

 ensues. 



y. Load a pipette (the fountain-pen 

 filler) with -5 c.c. water. Inject the 

 water quickly but gently into the pre- 

 epiglottidean pouch, not touching the 

 mucous surface with the glass pipette. 

 Observe the promptness of the ensuing 

 swallow and the number of the swallows 

 induced — usually one. 



Take up -5 c.c. of the dil. alcohol 

 (1 part ethyl alcohol, 3 parts water) 

 in the pipette and repeat the procedure, 

 introducing it into pre-epiglottidean re- 

 gion. Observe result — a prompt swallow, 

 followed usually by 3 or 4 more. 



Repeat the observation with -5 c.c. 

 water. Take up -5 c.c. oil in the pipette : 

 introduce it into pre-epiglottidean pouch 

 as before. Note result — usually no swal- 

 low, or one only after long delay. Repeat 

 the observation with -5 cc. water. 



yi. Touch lightly with the tip of a 

 long bristle mounted on a penholder 

 the anterior end of the arytaenoid carti- 

 lage or the mucous fold between the 

 arytaenoids. Sharp protective closure 

 of glottis immediately ensues, so forcible 

 sometimes as to produce an audible click ; 

 also a reflex strong expiratory cough. 



yil. Operation. Lower preparation 

 and place it supine on table with clip- 

 weights to feet, extending them symme- 



Wall of 



Chest 



Text-fig. 30. Simple stethograph for 

 respiratory movements of chest or abdomen. 

 A, stiff wire stem hinged to b, which in 

 turn is fixed to a bearing shown in the 

 left-hand figure at c. The bearing carries 

 also fixed to it the short thin aluminium 

 piece D, to which a thread going to an 

 ordinary myograph lever (not shown) is 

 attached. The wire stem is armed with 

 a needle-point to obviate its slipping on 

 the skin. The bearing is carried by c, 

 which is rigidly attached to a holder s, 

 clamped to any suitable standard. 



trically. Expose the superior laryngeal 



nerve. To do this, follow upward carefully the dissection, already made 



