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 esophagus. The palatinus muscle is much better developed than in the horse. 
The fibrous aponeurosis is for the most part replaced by muscular tissue. 
Cavity 
Dorsal Dorsal Septum of dorsal Frontal 
turbinate meatus mast turbinate vein 
Middle meatus 
Naso-lacrimal 
duct 
Ventral | 
turbinate 
Ventral Infraorbital 
meatus Nerve 
Mavillary_ 
sinus 
Masseter 
Palatine 
sinus 
Palatine Dorsal 
artery = — buccal 
glands 
Facial 
artery 
Facial vein 
Inferior labial Ventral buecal 
glands 
vessels 
Hypoglossal nerve _ — Sublingual gland 
Digastricus 
; - 
Mandibular duct Lingual nerve 
Fic. 381.—Cross-secTION OF ‘HAD OF Ox, 
Ay A 
/ 
The section passes through the medial canthi. Z.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 tonsils 
sinus, and is not visible internally, as is the case in most animals. 
J 
| 
Ma 
TF 
