384 



DIGESTIVE SYSTEM OF THE OX 



thick, horny epithehal 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 ritlge is the triangular 

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



Cavily 

 Superior Superior Sepluin of superior Frontal 

 turbinal meatus nasi turhinal vein 



\ 



Middle meatus 

 Inferior turbinal 



Inferior meatus 

 Maxillary sinus 

 Palatine sinus — j 



Palatine artery- 



Inferior labial 

 vessels 



Hypoglossal nerve 



Naso-lacrimal duct 



Infraorbital nerve 

 — ■ Massetcr 



Superior buc- 

 cal glands 



Facial artery 

 Facial vein 



Buccinator 



Inferior buccal 

 glands 



Subungual gland 

 Digastricus 



Submaxil- Lingual 

 lary duct nerve 



Fig. 282. — Cross-section of Head of Ox. 

 The section passes through the internal cantlii. L.n., Lingual arteries. The arrow indicates the communication 



between the maxillary anti jjalatine sinuses. 



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

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

 like opening with the organ of Jacobson. 



The soft palate is somewhat shorter than that of the horse, l)ut 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 



