92 ANATOMY AND PHYSIOLOGY FOR NURSES 



arteries; at its arch it furnishes the left carotid and left 

 subclavian on one side, and on the other only one, the in- 

 nominate, which is larger than either of those on the left 

 side. In the thorax the aorta gives off the bronchial 

 arteries one on each side; these nourish the lungs. It 

 also gives off at this portion the esophageal, mediastinal, 



IV. 



FlG. 48. Normal blood-currents in the heart and relative position of the 

 ventricles, auricles, and great vessels : JVC, Inferior vena cava; SVC, su- 

 perior vena cava; RA, right auricle; TV, tricuspid valves; RV, right ven- 

 tricle ; P, pulmonary valves ; PA, pulmonary artery ; Pv, pulmonary veins; 

 LA, left auricle; MV, mitral valves; L V, left ventricle; A, aortic valves; 

 Aa, arch of aorta (Page). 



and intercostal arteries. From the abdominal portion it 

 gives off the celia^c-axis with its three branches, the gas- 

 tric, hepatic, and splenic arteries; the superior and in- 

 ferior mesenteric, suprarenal, renal, spermatic (or ovarian), 

 lumbar, and middle sacrararteries. At the left side of the 

 fourth lumbar vertebra the aorta bifurcates into two 

 common iliacs, which each again divide into the internal 



