THE HEAD AND NECK. 



101 



ized as constrictors and elevators of the pharynx to facilitate deglutition ; a fibrous 

 coat, the pharyngeal aponeurosis, situated between the mucous and muscular 

 coats, for strength and support. This is also called the pharyngeal aponeurosis. 



Between what two points docs the pharynx extend ? 



From the base of the skull to the cricoid cartilage. 



What is the pliaryngeal tonsil, and where is it located ? 



It consists of a mass of lymphoid tissue similar to that found in the tonsil. 

 It is located on the back part of the pharynx, between the Eustachian orifices. 



INTERNAL PTERYGOID PLATE 

 Superior constrictor 



Pterygo-mandibular 



ligament 

 Stylo-hyoid ligament 



Middle constrictor 



Stylo-pharyngeua 



Inferior constrictor 



Thyroid cartilage 



Crioo-thyroid 

 Crieoid cartilage 



FIG. 62. THE MUSCLES OF THE PHARYNX. 



Distinguish between pJiaryngeal fascia and pharyngeal aponeurosis. 



The fascia is behind the pharynx. It is the fourth layer of deep cervical 

 fascia continued upward. The aponeurosis is one of the proper coats of the 

 pharynx, located between the mucous and the muscular coats. 



What important structures do yon find between the superior and middle constric- 

 tors of the pharynx ? 



The glosso-pharyngeal nerve and the stylo-pharyngeal muscle. (Fig. 63.) 



What do you find between the middle and inferior constrictors of the pharynx ? 



The superior laryngeal branch of the pneumogastric nerve, and the superior 

 laryngeal branch of the superior thyroid artery. (Fig. 63.) 



