DEVELOPMENT OF THE ARTERIES 



26 = 



Spinal ganglion 



~ Costo-cervical 

 trunk 



Subclavian artery 



FIG. 275. The development of the vertebral and subclavian arteries and the costo-cervical 

 trunk in a young rabbit embryo (modified after Hochstetter). Ill AB.-IV AB., Aortic arches; 

 A .v.c.b. cephalic portion of vertebral artery; C. d. and C.v., internal and external carotid arteries. 



FIG. 276. Arterial system of a human embryo of 10 mm. (His). X 18. Ic, Internal carotid 

 artery: P, pulmonary artery; Ve, vertebral artery; III-VI, persistent aortic arches. 



