RAT, A REPRESENTATIVE MAMMAL 



127 



in a given direction. The heart is a muscular pump which forces the 

 blood through the body. Its complete failure causes almost immediate 

 death. 



L. Common Caroiid A. 

 R. Common Caro^jci A. 



R. Subclavian A, 



= L. Subclavian f\. 



Innom* na-^ e A. 

 Ao »-^ »C A re Va 



—rj From L. Ven-^ricle 



Intercostal ^ 



Dorso,\ AorVou 



Sup«r»ov- SupT-arcoal A. 

 Co«\iac A. 



Renal A. 



Superior HesertVericA. 



K idney 

 Mio\u«v»V>a»- A. 



p«rma^ic. A. 

 ll-.ac A. 



Fig-. 41. — Diagram of the arteries of the rat from ventral view. 



Blood Vessels.— The large artery leaving the left ventricle is the 

 aorta, and it soon branches to supply the principal organs of the body. 

 From its arch arise the innominate, left common carotid, and then 



