THE VASCULAR SYSTEM. 



147 



The pulmonary veins convey the pure blood from the 

 lungs to the left auricle. There are three main trunks from 

 each lung. These six veins are arranged in pairs (Fig. 71), 

 constituting a left pair from the left lung; a median pair, 



.tn 



FIG. 79. A, VENTRAL VIEW OF HEART AND MAIN ARTERIES IN THE TRUNK 

 OF THE RABBIT. B, ARTERIES OF MAN. 



a, Right auricle; ca, left carotid; c. ax, coeliac axis; *. n, innominate; 

 il, common iliac; i. m, inferior mesenteric; /. r, left renal; r. r, 

 right renal ; r. c, right intercostals ; sin, superior mesenteric ; spm, 

 spermatic; sa, sacral; sb, left subclavian. 



composed of one branch from the right and one from the 

 left lung; and a right pair from the right lung. Each pair 

 forms a common trunk before entering the auricle. In 

 order to demonstrate these veins one must remove the heart 



