384 



DIGESTIVE SYSTEM OF THE OX 



thick, horny epithelial covering — forming the so-called dental plate or pad. The 

 palatine ridges extend from this backward about two-thirds of the length of the 

 hard palate. They are nearly straight, and, for the most part, are serrated on the 

 free edge. A median furrow extends between the ridges. The posterior third of 

 the palate is smooth. Between the dental plate and the first ridge is the triangular 

 papilla incisiva; on either side of this is a deep furrow, in which is the oral opening 



Cavity 

 Superior Superior Septum of superior Frontal 

 turbinal meatus nasi turbinal vein 



\ 



Middle meatus 

 Inferior turbinal 



Inferior meatus 

 Maxillary sinus 

 Palatine si7ius 



Palatine artery 



Inferior labial 

 vessels 



Hypoglossal nerve 



Naso-lacrimal duct jl 



Infraorbital nerve 



Massetcr 



Superior buc- 

 cal glands 



Facial artery 

 Facial vein 



Buccinator 



Inferior buccal 

 glands 



Sublingual gland 

 Digastricus 



Subynaxil- 

 lary duct 



Fk;. 2S2. — Cross-section ok Hkad of Ox. 

 The section passes throuKh the iiitoriuil canthi. L.a., Lingual arteries. The arrow indicates the communication 



between the maxillary and palatine sinuses. 



of the naso-palatine canal. This canal is two inches or more (ca. 5 to 6 cm.) in 

 length and opens on the floor of the nasal cavity; it also comnmnicates by a slit- 

 like opening ^\^th the organ of Jacobson. 



The soft palate is somewhat shorter than that of the horse, but is long 

 enough to close the isthmus of the fauces. The posterior pillars do not 

 extend to the entrance of the oesophagus. The azygos muscle is much better 



