mi 



The Lips (labia oris), the two fleshy folds which surround the rima or orifice of 

 the mouth, are formed externally of integument and internally of mucous mem- 

 brane, between which are found the Orbicularis oris muscle, the labial vessels, 

 some nerves, areolar tissue, and fat, and numerous small labial glands. The inner 

 surface of each lip is connected in the middle line to the corresponding gum by a 

 fold of mucous membrane, the frenulum the upper being the larger. 



Hypophysis 





Pharyngeal 

 tonsil 



Orifice of 

 auditory tube 



Nasal part of 

 pharynx 



Anterior arch of 

 atlas 



Odontoid process 

 of axis 



Oral part of 



pharynx 

 Body of axis 



Epiglottis 



Laryngeal part 



of pharynx 

 Aryepiglottic fold 



Cricoid cartilage 



Frenulum linguce 

 Mylohyoideus muscle 

 Hyoid bone 

 Thyroid cartilage 



Ventricular fold 

 Vocal fold 



Cricoid cartilage 



Isthmus of thyroid gland 

 FIG. 994. Sagittal section of nose mouth, pharynx, and larynx. 



The Labial Glands (glandules labiales) are situated between the mucous membrane 

 and the Orbicularis oris, around the orifice of the mouth. They are circular in form, 

 and about the size of small peas; their ducts open by minute orifices upon the 

 mucous membrane. In structure they resemble the salivary glands. 



