452 



THE RABBIT. PHYLUM CHORDATA 



cava receives also an azygos vein from the walls of the chest. 

 The external jugular is larger than the internal and lies nearer 

 the surface in the neck. The inferior vena cava is a large median 

 vessel which lies beside the dorsal aorta. It receives the following 

 veins : (i) The internal iliacs or hypogastrics from the back of 

 the thighs, (2) the external iliacs from the inside of the thighs, 

 (3) the iliolumbars from the hinder part of the abdominal 

 walls, (4) the genital veins, (5) the renal veins, (6) the large 



gonadidL 



gonddlaL 



left LlioLumbdr 



right iLiolurnbdr 



externdL iLldc 



inferior epLgditTic 



"femoTdL 



\;G5iCdL 

 LrvternaL LLidc 



Fig. 357. — Drawing of a dissection of the main arteries and veins of the pelvic 

 region of a rabbit. The arteries are shown hned with their names on the right 

 of the figure, the veins in solid black with their names on the left. 



hepatic veins from the liver, through which organ it passes on 

 its way to the heart. Blood from the stomach, intestines, pancreas, 

 and spleen is carried to the liver by the portal vein, but there is 

 no renal portal system (p. 332). Instead of going directly to the 

 inferior vena cava, the left genital may join the iliolumbar or the 

 renal, and the iliolumbar may join the renal. 



BLOOD 



The blood is a fluid, with proteins, glucose, salts, and other 

 substances in solution, and two main types of cell. The first of 

 these, the red cells, are biconcave discs without nuclei, which 

 contain haemoglobin, and the others, the white corpuscles, are 

 of various types, but all contain at least one nucleus. Details of 

 these cells, and of the other constituents of the blood. wiU be 



