122 GENERAL BIOLOGY. 



D. The pulmonary veins, short veins from the lungs 



which unite and open into the left auricle. 

 Diagram of the veins ! 

 The Arteries. 



A. One aortic arch, the aorta, which passes to the 

 right. It gives off: 



1. The innominate arteries, one on each side, 



giving rise to : 



(a) The common carotid artery, to the head. 



(b) The subclavian artery, which divides to 



form : 



(ad) The brachial artery, to the wing. 

 (bb) The pectoral artery, to the muscles of 

 the chest. 



2. The dorsal aorta, which passes posteriorly 



dorsal to the heart. 

 It gives off : 



(a) The coeliac artery, unpaired, to the pro- 



ventriculus, gizzard, spleen, pancreas, 

 duodenum, etc. 



(b) The anterior mesenteric artery, unpaired, 



to the rest of the small intestine. 



(c) The anterior renal arteries, paired. 



(d) The femoral arteries, paired. 



(e) The sciatic arteries, paired. The sciatic 



artery of each side gives off : 

 (aa) The middle and posterior renal arteries. 

 (/) The posterior mesenteric artery, unpaired, 

 to the large intestine. 



