DIGESTIVE SYSTEM OF THE PIG — THE MOUTH 



477 



Fig. 410. — Liver of Sheep, Parietal Surface; Hardened in situ. 

 1, Poaterior vena cava; S, falciform ligament; S, gall-bladder; 4, umbilical fissure. 



it usually extends about an inch (ca. 3 cm.) behind the last rib. The hilus is on the 

 visceral surface, close to the anterior basal angle; it is a round depression, not a 

 groove. The ventral end is narrower and thinner than the base; it is usually 

 situated opposite the tenth intercostal space or eleventh rib, a little above its middle. 



DIGESTIVE SYSTEM OF THE PIG 

 THE MOUTH 



The rima oris is extensive, the angles of the mouth being situated far back. 

 The upper lip is thick and short, and is blended with the snout; the lower lip is 

 small and pointed. The labial glands are few and small. 



The mucous membrane of the cheeks is smooth. The buccal glands are 

 compactly arranged in two rows opposite the cheek teeth. The parotid duct 

 opens opposite the fourth or fifth cheek tooth. 



The hard palate is long and narrow; it is marked by a median furrow, on each 

 side of which are twenty or more ridges. On its anterior part there is a long narrow 

 prominence, the incisive papilla, at the posterior part of which the incisive or naso- 

 palatine ducts open. There is a round prominence in front of the first pair of 

 incisors. 



The soft palate is very thick; its length in an animal of medium size is about 

 two and a half inches (ca. 5 cm.). Its direction almost continues that of the hard 



