8o. 



PHYSIOLOGY FOR BEGINNERS 



appendix of the auricle, right or left as the case may be. 

 Just below the two appendices, running from side to side 

 across the front and across the back of the heart, is a groove 

 occupied by a large quantity of fat. This groove marks the 

 separation between the two auricles above and the two ventricles, 

 as the lower chambers are called, situated below. On the right 



SVC IVC 

 TV 



FIG. 39. The sheep's heart. Back view. 



R, right side; L, left side; A'K, right ventricle; LV, left ventricle; A'./, right 

 auricle; KAx, its appendix; LA, left auricle; LAx, its appendix; Sl'C, 

 opening of superior vena cava ; /KC, opening of inferior vena cava ; PV, 

 opening of pulmonary veins. 



side, the rather thin wall of the right ventricle can be picked 

 up between the thumb and finger, so that one can tell distinctly 

 that there is a cavity inside. On the left side, the wall of the 

 left ventricle is so thick that it cannot be picked up in this 

 way. The heart then consists of the four chambers, the right 



