198 



THE HUMAN BODY. 



capillaries, as may readily be seen by tracing the course of 



the vessels in Fig. 57. 



The Vessels connected with the Different Chambers of 



the Heart. One big ar- 

 tery, called the aorta, 

 springs from the left 

 ventricle ; it runs back 

 to the pelvis after giving 

 off very many branches" 

 on its way and then di- 

 vides into an artery for 

 each leg. Its big branches 

 divide into smaller and 

 these into smaller again,- 

 until they become too 

 small to be traced by the 

 unaided eye. They spread 

 through the whole body, 

 to muscles, and bones, 

 and skin, and brain, and 

 stomach, and intestines, 



PIG. 58. VIEW op THE HEART AND GREAT QTir l liVnv nnrl Virlnpvc 

 VESSELS FROM BEFORE. ana liver, ana Kianeys , 



The pulmonary artery has been cat short thev finally end HI the SVS- 



close to its origin. 1, right ventricle ;' 2, left " \ 



ventricle; 3, root of the pulmonary artery; 4, temiC Capillaries The 

 4', arch of the aorta; 4", the descending thoracic, 



aorta; 5, part of the right auricle; 6, part of the svstemio VPl*n<? 



left auricle; 7,7', innominate veins joining to * B 

 form the vena cava superior; 8, inferior vena_ TYInnd f vrkTVl f 



cava; 9, one of the large hepatic veins ; X, Di a irom t 



placed in the right aurictilo- ventricular groove, ,, -,.. 



points to the right or posterior coronary artery ; * 8 OI tne Uluerent 



X, X, placed in the anterior interventricular j n ii 



groove, indicate the left or anterior coronary ganS, and all tnese 

 artery. 



What artery arises from the left ventricle t To what point does 

 it run? What does it give off on its course? How does it end? What 

 becomes of its branches? In what do they end? What vessels col- 

 lect the blood from the systemic capillaries? 



