Dorsal aorta ^ 



N\ \N W N\ N\ 





Yeniral aorta 



A. Embryonic 

 ^Carotid^ 



Afferent- 

 Efferent- 



Subclavia 



-Dorsal aorta- 

 B. Elasmobranch C. Urodele 



ulmonary 

 Subclavian 



'arotid 



Radix of 

 dorsal aorta 



Pulmonary 



D. Anura 



Radix of 

 dorsal aorta 



Subclavia 



Carotids 



Carotids 



Subc 



VI 



Pulmonary 



■Aorta 



orta 



Subclavian 



E. Reptile (primitive) F. Mammal (embryo) G. Mammal (adult) 



Fig. 135. Comparative Anatomy of the Aortic Arches. Drawing (A) is 



the generalized embryonic condition; (B) shows the division of each 



arch to form an afferent and efferent branchial; (C) to (G) show the 



reduction of the arches in the different groups of vertebrates. 



