CIRCULATION OF THE BLOOD. 



28. 3rd. The intercostal arteries are several in number, and 

 run between the ribs on each f ide of the body; 



29. 4th. The ccelinv artery, which is distributed to the stomach, 

 the liver, and the spleen ; 



30. 5th. The mesenteric arteries, which ramify upon the intestines; 



31. 6th. The renal arteries which penetrate into the kidneys ; 



32. And 7th. The iliac arteries, which in a manner terminate 

 the aorta, and which convey blood to the lower extremities, 

 descend along the thighs and are there called femoral arteries ; 

 then they divide into many branches which terminate in the 

 feet. 



33. The reins, which receive the blood thus transmitted to all 

 parts of the body, follow very nearly the same course as the 

 arteries; but they are larger, more numerous and generally situ- 

 ated more superficially. A great number of these vessels pass 

 beneath the skin, others accompany the arteries, and, at last, they 

 all unite to form two great trunks which empty into the right 

 auricle of the heart, and which have received the names of vena 

 cava superior and on, a cava infer im . (page 37. fig. 6.) 



34. The veins which come from the intestines present an im- 

 portant peculiarity. After uniting in a large trunk, they penetrate 

 the liver, and there ramify like the arteries ; there they again unite 

 into a trunk and terminate in the inferior vena cava close to the 

 heart. This arrangement of the vessels is called thesysiem of the 

 Venn port a 



35. The venous blood, poured by the vcnce cavce into the right 

 auricle of the heart, descends from it into the ventricle of the 

 same side. 



36. The right ventricle of the heart gives rise to a large artery, 

 called the fmiutonart/ aricry, which next receives this same blood,, 

 and carries it into the lungs, (page 37. Jig. 6.) 



28. What arteries run between the ribs ? 



2'). What is the distribution of the Cceliac artery ? 



30. What arteries ramify upon the intestines? 



31. What is the distribution of the renal arteries? 



31 What arteries are di tributed to the lower extremities ? 



33. What i* the general course of the veins? In what respect do the 

 veins differ from the arteries generally ? Where do the gre,.t venous trunks 

 empty ; What are they called ? 



34. What is the peculiar arrangement of the veins coming from the in- 

 testines ? What is it called > 



35. What becomes of the venous blood after entering the right auricle of 

 the heart ? 



3f>. What artery arises from the right ventricle? Into what part does the 

 pulmonary artery carry the blood '/ 



E2 



