ARTERIAL SYSTEM OP BIRD. 



227 



which, constitute the mass of flesh lying on the breast, are 

 supplied with blood by the arteries of the upper extremities, 

 which here possess a manifest predominance. The aorta, soon 

 after its origin, subdivides into three large branches ; of which 

 the first two (one on either side giving-off the subclavian and 

 carotid arteries) convey the blood to the head, the wings, and 



Lingual artery 



Aorta 



Sacral artery Cloaca 



Fig. 125. AKTERIAI, SYSTEM OF BIRD. 



the muscles lying on the thorax ; whilst the middle one curves 

 backwards and downwards, and becomes the descending aorta. 

 ISTow that which is here the continuation of the great side 



