DEVELOPMENTAL EVOLUTION 



239 



Internal carotid artery. 

 Foramen lacerum medium. 

 Cartilage of Eustachian tube. 

 Cavity of Eustachian tube. 



Levator palati. 



Inferior turbinated bone. 

 Lateral recess of pharynx. 



Levator cushion. 



Superior constrictor muscle. 

 Glands in soft palate. 



Uvula. 



Palatopharyngeus. 

 Circumvallate papillae. 

 Sulcus terminalis. 

 Glossopharyngeal nerve. 

 Foramen caecum. 

 Lymphoid follicle. 



Middle constrictor muscle. 

 Epiglottis. 

 Pharyngo-epiglottic fold. 



Lingual artery. 

 Hyoglossus muscle. 

 Hyoid bone. 

 Superior laryngeal artery. 



Internal laryngeal nerve. 

 Aryteno-epiglottic fold. 

 Sinus pyriformis. 



Superior aperture of larynx. 

 Inferior constrictor muscle. 

 Top of cricoid cartilage. 



FIG. ioo. THE ANTERIOR WALL OF THE PHARYNX WITH ITS ORIFICES, 



SEEN FROM BEHIND. 



The specimen from which the drawing was made was obtained from a formalin- 

 hardened body by removing the posterior wall of the pharynx while leaving the 

 anterior wall undisturbed. The following points should be noted : the greatest 

 width of the pharynx, above, at the lateral recesses ; the posterior nares, with the 

 inferior turbinated bones seen through them ; the levator cushion ; and the 

 pharyngeal portion of the tongue. 



