248 



THE PIGEON 



B. The Arterial System. 



The aortic arch arises from the right side of the left ventricle anteriorly and 

 gives oft a right and a left innominate artery. Each innominate divides into 

 two branches : 



(a) The common carotid artery, which gives off an internal carotid to the 

 brain and an external carotid to various parts of the head. 



{b) The subclavian artery, which gives oft the brachial artery to the wing 

 and the large pectoral artery to the pectoralis major muscle. 



The aorta then arches round to the right and passes backwards as the dorsal 

 aorta, giving oft the following arteries in its course : — 



(a) A median cceliac artery, passing to the mesentery and supplying the 

 stomach, gizzard, and anterior portion of the intestine. 



Coccygeo-mesenteric 

 vein----' 

 Internal iliac 

 vein 



Fio. 87, 



Rudimentary righ't oviduct 



-The Pigeon (Columba). A. 



\ Left oviduct 

 'Internal iliac artery 

 Cloaca 



the Vascular System, and the Renal 

 and Eeproduotive Systems of the Female ; B. the Renal and Reproductive 

 Systems of the Male. {See also Fig. 86.) 



