1266 



A MANUAL OF ANATOMY 



movement, in conjunction with the action of the posterior pillars 

 of the fauces, shuts off the naso-phar5mx, thus preventing regurgita- 

 tion into and through the nasal fossae. The lower portion of the 

 middle constrictor and the inferior constrictor diminish the calibre 

 of the buccal compartment of the pharynx. Coming into action 

 during the second stage of deglutition, they grasp the bolus of food 

 and press it downwards into the oesophagus. The constrictor 

 muscles contract rapidly, and in order from above downwards. 



Tensor Palati 

 Levator Palati 



Pterygo-mandibular Ligament 



Stensen's Duct 



Stylo-hyoid Ligament (cut)._ 

 Superior Constrictor 

 Stylo-pharyngeas . 



Glosso-pharyngeal Nerve - 



Middle Constrictor ... 



Hypoglossal Nerve and 



Hyo-glossus 

 Superior Laryngeal Nerve -- 



Superior Laryngeal Artery __ 



Inferior Constrictor 



Buccinator Muscle 

 Mylo-hyoid Muscle 



— Crico-thyroid Muscle 



CEsophagus -liHWIBfllllir''''" "'"'""'!!'.. Trachea 



"■^fiii'r- '"''erior Laryngeal Nerve 

 Inferior Laryngeal Artery 



Fig, 520. — Dissection showing the Cheek, Pharynx, Submaxillary 

 Region, and Larynx (Right View). 



For a description of the stylo-pharyngeus and palato-pharyngeus 

 muscles (including the salpingo-pharyngeus), see Index. 



Pharyngeal Aponeurosis. — This is situated between the muscular 

 coat and the mucosa. Inferiorly it is weak and indistinct, but 

 superiorly it acquires greater firmness and density, expecially whert; 

 it is attached to the basi-occipital, the apex of the petrous part oi 

 the temporal bone, the adjacent portion of the Eustachian tube, 



