446 



DIGESTIVE SYSTEM OF THE OX 



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

 to close the isthmus faucium. The posterior pillars do not extend to the origin of 

 the oesophagus. The palatinus muscle is much better developed than in the horse. 

 The fibrous aponeurosis is for the most part replaced by muscular tissue. 



Dorsal 



turbinate 



\ 



Cavity 

 Dorsal Heptum of dorsal Frontal 

 meatus nasi turbinate vein 



Middle meatus- 



Ventral 

 turbinate 



Naso-laerimal 

 duct 



lorhital 

 nerve 



Inferior labial 

 vessels 



Hypoglossal nerve 



Masseter 



Dorsal 

 buccal 

 glands 

 Facial 

 a rtery 

 Facial vein 



Buccinator 



jitral buccal 

 glands 



al gland 



Mandibular duct Lingual nerve 



Fig. 381. — Cross-section of Head of Ox. 



The section passes through the medial canthi. L. a., Lingual arteries. The arrow indicates the communication be- 

 tween the maxillary and palatine sinuses. 



The isthmus faucium is wide and dilatable. On either side, behind the an- 

 terior pillar of the soft palate, there is a deep depression, the tonsillar sinus (Sinus 

 tonsillaris) ; lateral to this is the compact, bean-shaped tonsil, which is about one 

 to one and a half inches (ca. 3 to 4 cm.) in length. The tonsil does not project into 

 the isthmus faucium, but outward instead: hence it does not occupy the tonsillar 

 sinus, and is not visible internally, as is the case in most animals. 



