THE HEAD AND NECK 



1267 



and the internal pterygoid plate of the sphenoid bone. It receives 

 an accession of strength in the median line from a strong bimdle of 

 fibres which descends from the pharyngeal tubercle on the under 

 surface of the basilar process of the occipital bone, and which forms 

 the raphe of the pharynx. 



Interior of the Pharynx. — The mucous membrane, which forms 

 the fourth stratum in the pharjoigeal wall, is of a papillary character, 

 and has the following important continuations : (i) with the mucous 

 membrane of the Eustachian tube, and thence with that of the 



Frontal Air-Sinus 



Superior Meatus 



S uperior Concha 



Inferior Meatus 

 Hard Palate(insection)7rrir___j,_,.,-_- 

 Tongue ^'\'!j '■ -^ 



Mandible (in section) _. 



Genio-hyo-g^ossus 



Genio-hyoid ■' 



Spheno-ethmoidal Recess 



^,- Sphenoidal Air-Sinns 

 Middle Concha 



Middle Meatus 



^-LV Inferior Concha 



— .--I'l Eustachian Orifice 



-^- — Salpingo-pharyngeal 

 Fold 



...Soft Palate 



^^ Epiglottis 



^Mr Pharynx 



Ventricle of Larynx ,' 

 Thyroid Cartilage 

 Cricoid Cartilage 



te^ 



(Esophagns 



Trachea 



Fig. 521. — Sagittal Section through the Nasal Fossa, Mouth. 

 Pharynx, (Esophagus, and Larynx. 



(The Outer Wall of the Right Nasal Fossa is shown.) 



tympanum or middle ear ; (2) With that of the nasal fossae through 

 the posterior nares ; (3) with that of the buccal cavity through the 

 isthmus faucium; {4) with that of the larynx through the superior 

 laryngeal aperture; and {5) with that of the oesophagus. At its 

 upper and back part it is richly provided with lymphoid tissue, 

 to be presently referred to, and in the submucous tissue there are 

 many acinous glands of a mucous character. 



The soft palate projects into the cavity of the pharynx in a down- 

 ward and backward direction, and divides it into tWo regions, 

 upper and lower. The upper region is known as the naso-pharynx. 



