DEVELOPMENT OF THE ARTERIES 



265 



Spinal ganglion 



Vertebral 

 artery 



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.-IVA B., 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; IH-VI, persistent aortic arches. 



