568 



TEXTBOOK OF ZOOLOGY 



right aortic arch, and continues cephalad on the left side of the 

 inter auricular space. 



The aortic arches may be traced laterally and are seen to bend 

 around the esophagus and unite with one another on the dorsal side 

 of the esophagus, ventral to the vertebral column, to form the median 

 dorsal aorta. An esophageal artery may branch from the left aorta. 



Rt. interna] ccroti'd_ 



Rt. aorta^-.^ps=^ 



Rfc. Subdavian A 

 Rt aorta 



Dorsal aorta 



RthepaticA. 

 Ant. mesenteric A 



SpermaUc A 



Renal A A A 



Kidney_ 



Femoral A.^fl _ _ ^ ^ ~^: =;fs:^ 



Sciatic A-i 



Cow. 



^Lt. common carotid A. 



External carotid A. 



internal carotid A. 



-Connection, 3''-^h.^^arcli 



_3i ^^.L.aorta 



Pulmonary A. 



-.-LpajponaryA. 

 -br^-L. iubclavian A. 



\ Ventricle 



Antqastric 



Coeliac A. 



Ventral qastric A. 



ijTis^ .Hepabo-duodenalA. 

 y 1 _5up. mesenteric A. 

 'n htestinat A. 



Lumbar A- 



Adipose A. 



Fig. 297. — Heart and arterial system of horned lizard, ventral view. 



The right and left comtnon carotid arteries arise from the right 

 aortic arch at the point where it leaves the left aortic arch. The first 

 branch of each is the external carotid which supplies the lower jaw. 

 Each of the common carotids next gives off an internal carotid artery 

 which supplies the right and left sides of the head. Now the common 



