THE VASCULAR SYSTEM 



175 



Arch I 



Pulmonary 

 Arteries 



Vertebral. 

 Subclav^an- 



FiG. 87. — Diagrams of Reconstructions of Aortic Arches in Cat Embryos. 



{After Coulter, Anatom. Record, Vol. 3, p. 580.) 



A. aortic arches of a Cat embryo of 4.5 mm. B. aortic arches of a Cat 



embryo of 5 mm. C. aortic arches of a Cat embryo of 5 mm. D. aortic 



arches of a Cat embryo of 5 mm. E. aortic arches of a Cat embryo of 10 mm. 



