CHAPTER VII 

 THE CIRCULATORY SYSTEM 



THE ORGANS OF CIRCULATION 



The orgauK concerned with the circuhttion of blorjct and hjmph are 

 tho hoart, the arteries, the veins, the capillaries, and tlie lym- 

 phatics. 



Great cmonary vev\ 



Small coronarij v 



Righl coronary artery 



Fig. 'Mi. — Kiglit view 111' heart. The piTicaniiuin, epicardiuni, and subepi- 

 canlial fat have been removed. Cardiac ves.sels are injected. (Sisson, 

 Anatomy of Domextic Animals.) 



The heart is the central organ <if this system (Figs. 36, 37). It 

 is situated in the thorax, lietween the lungs and opposite the third 

 to sixth ribs. It is attached at the l.)asc to the large blood-vessels, 

 no 



