The Frog: A Representative Vertebrate 65 



to this : the pulmo-cutaneous artery which carries unoxygenated blood 

 from the heart to the skin and lungs. 



Soon after leaving the heart, the truncus arteriosus branches into 

 three main arteries on either side: the carotid, the systemic, and the 

 pulmo-cutaneous. The systemic arch of each side curves dorsally and 



EXTERNAL CAPOTIO 



COMMON CAROTID. 

 CUTANEOUS 



CONUS ARTERIOSUS 

 LUNG 



VENTRICLE 



COCLIACO-MESENTERIC 



KIDNEY - 

 RENAL- 



COMMON lUAC. 



INTERNAL CAROTID 

 CAROTID GLAND 



AORTIC ARCH 



PULMO-CUTANEOUS 



_SUBCL AVIAN 



. MESENTERIC 

 .PANCREAS 



'J. SPLENIC 



.SMALL INTESTINe 



.LARGE INTESTINE 



Fig. 16. — The arterial system of the bullfrog. 



posteriorly. These two arches join to form the large dorsal aorta. 

 Before these arches join, each gives off several arteries, including the 

 subclavian which supplies the forelinibs. The first important artery 

 arising from the dorsal aorta is the coeliaco -me sent eric which divides into 

 the mesenteric and the coeliac or gastric. The mesenteric supplies the 



