THE LIZARD. 165 



stomach, spleen, pancreas, duodenum, and left lobe of the 

 liver ; and a posterior, the superior mesenteric artery, 

 which supplies the ileum. 



i6o. The inferior mesenteric arteries {i.m), three small vessels 

 arising from the aorta at about the level of the pubes and supplying the 

 rectum. 



161. The portal vein (ptji), a large vessel lying in the 

 duodeno-hepatic omentum, parallel to the pancreas : it 

 receives gastric veins from the stomach, and small 

 pancreatic veins from the pancreas, and at its distal end 

 is formed by the union of splenic and mesenteric veins 

 from the spleen and intestine respectively. 



162. The separate gastric portal veins, two or three small vessels 

 taking blood directly from the stomach to the liver. 



163. Two small veins taking blood from the dorsal body-wall to the 

 right lobe of the liver : by dissecting off the peritoneum they are seen to 

 spring from the azygos (cardinal) vein (az), a longitudinal trunk lying , 

 on the right side of, and close to the vertebral column, which receives 

 blood from the dorsal region of the trunk, intercostal spaces, &c., and 

 joins the precaval close to the entrance of the subclavian. 



164. The right hepatic artery (r.A.a), a small vessel springing from 

 the dorsal aorta, and passing parallel to the veins mentioned in § 163 

 to the right lobe of the liver. 



165. The common bile-duct, running parallel to the portal Vein 

 and opening posteriorly into the duodenum : at its anterior end it is 

 formed by the union of the cystic duct from the gall-bladder and the 

 hepatic duct from the liver itself. 



In the male : — 



166. The testes (Figs. 40 and 41, t), two white ovoidal 

 bodies, that on the right sitle situated just posterior to the 

 right lobe of the liver, that on the left somewhat further 

 back. 



167. The epididymis (ep), a. whitish, elongated body 

 attached to the inner face of each testis, and extending 

 backwards into the pelvic cavity (see § 190). 



