24 THE FROG 



111. There are three hepatic veins from the liver. These 

 return the blood received from the hepato-portal 

 veins (Drawing 6). 



112. There are four or five renal veins from each kid- 

 ney, which return the blood received from the reno- 

 portal veins (115). 



113. The adipose veins join the first pair of renal veins, 

 which carry blood from the fat bodies. 



114. The ovarian or spermatic veins convey blood from 

 the ovary or testis respectively, and either join the 

 renal veins or establish direct connections with the 

 postcaval vein (101). 



115. Note on the dorsolateral margin of each kidney the 

 reno-portal vein. This receives branches from the 

 body wall and the oviduct. Trace it back and note 

 that it results from the union of 



116. the sciatic vein from the dorsal surface of the thigh, 

 and 



117. the external iliac vein from its ventral surface. 

 Trace back the external iliac until you find its 

 juncture with the pelvic vein (78) running to the 

 abdominal vein. The external iliac and pelvic are 



118. branches of the femoral vein, the largest vessel re- 

 turning blood from the hindleg. 7/ time permits trace 

 back the sciatic and femoral veins and study the dis- 

 tribution of their tributaries in the leg. 



Return to the cut ends of the precaval vein. Trace for- 

 ivard the right precaval vein and note the following tribu- 

 taries, by whose juncture it is formed (119, 123, 125). 



119. The external jugular vein, returning blood from 

 the head, is formed by the union of 



120. the lingual vein from the tongue and floor of the 

 mouth and 



