THE LOWER YEK'IEBKATA. 



145 



arteries, and supplying the same organs, viz. stomach, in- 

 testines, liver and spleen. Farther along we find a series 

 of small median arteries dividing into right and left 

 almost immediately 

 which answer to 



the renal and genital ->^\ ^ i / s*-*. *<,*&**</*.** 



arteries of the rab- 

 bit. The stt6c/avta?i 

 arteries arise from 

 the right and left 

 systemic arches, as 

 do also two occipito- 

 verlebral arteries, 

 supplying part of 

 the head and the 

 region of the ver- 

 tebral column. The 

 iliac$ are much the 

 same as in the rab- 

 bit, but in the 

 absence of a tail 

 there is no caudal 

 artery. 



From the carotid 



arch, just before the carotid gland, there arises a lingual 

 artery to the tongue ; beyond the gland the carotid artery 

 soon divides into internal and external carotids which supply 

 the head. 



8. The Veins. Only the pulmonary veins enter the 

 left auricle in spite of the fact that some oxygenation of 

 the blood occurs through the skin, this blood returns to mix 

 with that of the ordinary veins. As in the rabbit, there 

 are three large caval veins, but these unite into a distinct 

 chamber (the sinus venosus) before opening into the right 

 auricle. As before, each precaval vein is formed by the 

 union of external and internal jugulars and subclavian, but 

 the internal jugular is relatively larger, more lateral in 

 position, and its last portion, after it has been joined by an 

 extra sulscapular vein, is generally distinguished as the 

 ZOOL. 10 



Fig. 71. PRINCIPAL VEINS OF FBOO. 



