I 20 



APPLIED ANATOMY. 



water in the mouth. The nozzle of a rubber bag is introduced into one nostril, 

 closing both nostrils with the fingers and thumb of the unengaged hand. On telling 

 the patient to swallow, the bag is compressed and the air enters the Eustachian tube. 

 As the patient swallows, the tensor palati muscle opens the mouth of the tube and 

 as the bag is compressed the air rushes up the tube. Sometimes the vapors of ether, 

 chloroform, etc., are used. The third method is by the Eustachian catheter. 



The Eustachian catheter is a small, hard rubber or silver tube, slightly bent 

 at the extremity and long enough to reach from the anterior nares in front to the 

 posterior wall of the pharynx. The end of the catheter having been inserted into 



perior turbinate 



Sphenoidal sinus 



Middle turbinate 

 Inferior turbinate 



Pharyngeal tonsil 

 Fossa of Rosenmuller 

 Eustachian tube 



Atlas 



Odontoid process 

 of axis 



Body of axis 



Third cervical vertebra 



FIG. 151. Anteroposterior frozen section, showing a lateral view of the pharynx and the relation of the various 



neighboring structures. 



the mouth of the Eustachian tube, air is blown in with the Politzer air-bag. By 

 means of a rubber tube going from the patient's ear to the surgeon's ear, the air can 

 be heard entering the middle ear. 



Introducing the Eustachian Catheter. In introducing the Eustachian catheter, 

 the tip of the nose is to be tilted upward until the anterior nares are raised to the 

 level of the floor of the nose. The tip of the catheter is then passed first upward 

 (Fig. 152), then along the floor until it is felt to pass beyond the soft palate and strike 

 the posterior wall of the pharynx (Fig. 153). It is usually advised to enter the 



