DIGESTIVE SYSTEM OF THE PIG—THE MOUTH 47 
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Fic. 410.—Liver oF SHeep, Parretat SurrFace; HARDENED in situ. 
1, Posterior vena cava; 2, falciform ligament; 3, 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 
