102 GENERAL BIOLOGY. 



(a) Raise the liver and find the vein that 

 enters its left lobe, the hepatic portal 

 vein. Trace it posteriorly and find the 

 veins that unite to form it : 

 (act) The gastric vein : from the stomach. 

 (bb) The intestinal veins. 

 (cc) The splenic vein. 



The hepatic portal vein just before entering the 

 liver gives off a branch that anastomoses with 

 the anterior abdominal vein. 

 D. Yeins Opening into the Sinus Venosus. 



(a) The inferior vena cava: a median vein 



which opens into the posterior part of 

 the sinus venosus. It brings blood to 

 the heart from the liver and kidneys, 

 etc., and from the hind limbs. It is 

 made up by : 



(aa) The renal veins : from the kidneys. 

 (bb) The genital veins, 

 (cc) The right and left hepatic veins from 

 the liver. These open into the 

 vena cava inferior close to the sinus 

 venosus. 



(b) The right superior vena cava. It brings 



back blood from the right side of the 

 head and body and from the right fore- 

 limb. It is formed by : 

 (aa) The external jugular vein : formed by: 



