AVES 



605 



right auriculoventricitlar valve to the rigJit ventricle. Then it is 

 pumped, with the contraction of the heart, through a semilunar valve 

 into the pulmonary artery which divides to supply each lung. The 

 aerated blood from the lungs returns to the left auricle by way of 

 the two pulmonary veins. It passes from the left auricle to the left 

 ventricle through the hicuspid or left auriculoventricular valve. Then 



^u. 



L. CAROTID 

 R. PECTORAL 

 R. BRACHIAL 



R.BRACHIO- 

 CEPHALIC 

 R. ATRIUM 

 L. BRACHIO- 

 CEPHALI C 

 ^PULMONARY 

 LaoRTIC ARCH 

 L. ATRIUM 



/-R. V 



ENTRICLE 



ENTRICLE 



COELI AC 

 LUMBAR 



RENAL 



ANTERIOR 



MESENTERIC 



DORSAL 



AORTA 



FEMORAL 



SCI ATIC 



I LIAC 



-POSTER! OR 



MESENTERIC 



CAUDAL 



Fig. 321. — Heart and arteries of domestic chicken from ventral view. (Drawn 



by Titus Evans.) 



it is pumped through the semilunar valve in the base of the aorta 

 and out the right aortic arch. Just at the anterior level of the heart 

 this arch passes through the pericardium and gives off the right and 

 left brachiocephalic arteries to the neck, head, and arms ; then it 

 curves to the right and extends posteriorly around the heart as the 

 dorsal aorta. The dorsal aorta supplies esophageal branches to the 



