BLOOD VESSELS 



411 



Car. /I Vi Car. 



Fig. 325. — The principal arteries of a pigeon. — From Thomson. 



A.M., Anterior mesenteric ; Br., brachial ; C, caudal ; Car., carotid ; CL., cceliac ; D.A., dorsal aorta; 

 F., femoral ; IL., iliac ; L.A., left auricle ; L.V., left ventricle ; P., pectoral ; P. A., pulmonary artery ; 

 P.V., pulmonary vein; p.m., posterior mesenteric; R., renals ; R.A., right auricle; R.V., right 

 ventricle ; Sc, sciatic. 



shown in Fig. 326. There are three venae cavae, as in the frog. 

 Each superior vena cava is formed by the union of a jugular, a 

 brachial, and a pectoral vein. The jugulars anastomose under 

 the base of the skull. The inferior vena cava arises by the junction 



