104: GENERAL BIOLOGY. 



(a) The anterior or carotid arch. Its chief 



branches are : 



(aa) The lingual artery : to the tongue. 

 (bb) The carotid artery : to the brain, etc. 



(b) The middle or aortic arch. It runs around 



the throat to the vertebral column and 

 unites with its fellow to form the dorsal 

 aorta. It gives off on each side at the 

 level of the arm : 

 (aa) The subclavian artery : to shoulder 



and fore-limb. 



(bb) The vertebral artery : to the vertebral 

 column and back, etc. 



(c) The third, posterior, or pulmonary arch: 



to the lung on each side. On the way 

 it gives off: 



(aa) The cutaneous artery : to the skin, 

 etc. 



(d) The dorsal aorta and its branches. 

 Posterior to the union of the two aortic 



arches the dorsal aorta lies in the 

 median line just ventral to the vertebral 

 column. It gives off the following 

 branches : 



(aa) The coeliaco-mesenteric artery : a me- 

 dian artery to the stomach and 

 intestine. Its branches are : 

 (aaa) The ereliac artery: to the 

 stomach and to the liver. 



