ARTERIAL SYSTEM OF 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 
External carotid 
artery 
Ischiatic 
artery 
Aorta 
Renal 
Subclavian 
artery 
Mammary 
artery 
Femoral 
artery 
Sacral artery Cloaca 
Fig. 125. —Arterial System of Bird. 
the muscles lying on the thorax; whilst the middle one curves 
backwards and downwards, and becomes the descending aorta. 
hTow that which is here the continuation of the great side 
Q 2 
