666 PHYLUM CHORDATA I CLASS AMPHIBIA 



Then it divides into two iliacs, each of which supplies the bladder 

 (hypogastric), the ventral body wall (epigastric), and the leg (sciatic). 



III. The pulmocutaneous arch, the most posterior, 

 corresponding to the fourth efferent branchial in the 

 tadpole, gives off — 



the cutaneous artery to the skin, 



and the pulmonary artery to the lungs. 



The venous system. — I. Each superior vena cava is 

 formed from the union of three veins, and each of these 

 three is formed from two smaller vessels. 



External (Lingual from the mouth and tongue, 

 jugular. \ Mandibular from the lower jaw. 



(Internal jugular from the inside of the skuU. 

 Subscapular from the back of the arm and 

 the shoulder. 

 ( Brachial from the arm. 

 Subclavian. -! Musculo-cutaneous from the skin and sides 

 t of the body. 



II. The inferior vena cava begins between the kidneys, 

 and ends in the sinus venosus. Its components are as 

 follows : — 



("Efferent renal veins from the kidneys, 

 interior J Genital veins from the reproductive organs, 

 vena cava. (Efferent hepatic veins from the Hver. 



The renal portal system, by which venous blood from 

 the posterior region filters through the kidneys on its way 

 back to the heart, is as follows on each side : — 



I A posterior branch of the femoral vein from the 

 hind-limb forms the renal portal vein, which 

 receives the sciatic from the back of the leg, and 

 the dorso-lumbar veins from the dorsal wall of 

 the body, and oviducal veins in the female. 



The anterior branch of the femoral vein is called the 

 pelvic, and unites with its fellow of the opposite side, and 

 gives origin to a median vein which runs to the liver — the 

 anterior abdominal. By means of an anastomosing branch, 

 the anterior branch of the femoral is also connected to the 

 sciatic. 



The hepatic portal system, by which venous blood from 



