THE ARTERIAL SYSTEM. 



543 



corresponding to the second efferent branchial in the 

 tadpole, gives off — 



The laryngeal artery to the larynx ; 



The oesophageal to the oesophagus ; 



The occipito - vertebral to the head and vertebral 



column ; 

 The subclavian or brachial to the fore-limb. 

 From the left aortic arch, just as it unites with its fellow 

 of the other side to form the dorsal aorta, or from the begin- 

 ning of the dorsal aorta, 

 there is given off the 

 coeliaco-mesenteric to 

 the stomach, intestine, 

 liver, and spleen. 



Further back the 

 dorsal aorta gives off — 

 The renal arteries 

 to the kidneys, 

 and the genital 

 arteries to the 

 reproductive or- 

 gans ; 

 The inferior mes- 

 enteric to the 

 large intestine. 

 Then it divides into 

 two iliacs, each of which 

 supplies the bladder 

 (hypogastric), the ven- 

 tral body-wall (epi- 

 gastric), and the leg 

 (sciatic). 



III. The pul mo- 

 cutaneous arch, the 

 most posterior, corresponding to the fourth efferent branchial 

 in the tadpole, gives off — 



The cutaneous artery to the skin; 

 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. 



Fig. 232.- 



-Arterial system of frog.- 

 Ecker. 



-After 



/., Lingual; c, carotid; j., systemic; c«., 

 cutaneous ; p., pulmonary ; v., occipito-verte- 

 bral ; dr., brachial; elm., cceliaco-mesenteric ; 

 r. , renals ; il. , common iliacs ; h. ,'hsemorrhoidal. 



