ORGANS OF DIGESTION. 133 



be seen by cutting away the zygomatic arch and the mas- 

 seter muscle. From near the ventral angle of the gland 

 a duct leads to the roof of the mouth posterior to the 

 molar tooth. 



The liver is the largest gland in the body and is situated 

 immediately caudad of the diaphragm (Fig. 54), and in 

 contact with the right lateral and cephalic surfaces of 

 the stomach. It is composed of five lobes: the caudate, 

 right lateral, right central, left central, and Spigelian. If 

 the abdominal wall is removed, a ventral view of the 

 liver shows the caudate lobe to be the most caudal part 

 of the organ on the right side. Its dorsal surface is 

 in contact with the kidney. Cephalad of this is the 

 right lateral lobe in contact with the diaphragm. These 

 two lobes are of about the same size. The right central 

 lobe is much larger than the two preceding ones and 

 presents a deep cleft in which is lodged the green gall- 

 bladder or cyst. The left central lobe is small, lies in 

 contact with the diaphragm, and is separated from the 

 right central lobe by the broad or falciform ligament, 

 which is a double layer of peritoneum, apparently pending 

 from the diaphragm. The left lateral lobe is about the size 

 of the right central lobe and is in contact with the dia- 

 phragm, stomach, and right central lobe. The Spigelian 

 lobe is seen by raising the liver from the stomach. It 

 is the smallest lobe and lies adjacent to the esophagus. 



The right lateral fissure is between the right lateral 

 and right central lobes. The cystic notch shelters the 

 gall-bladder. The umbilical fissure is between the two 

 central lobes. The round ligament lies in this fissure. 

 The left lateral fissure is between the left central and 

 left lateral lobes. The transverse fissure separates the 

 ventral from the Spigelian lobe and lodges the portal 

 vein, hepatic artery, and the main bile-ducts. 



