82 



PHYSIOLOGY FOR BEGINNERS 



CHAP. 



having thickened bands. Open the left auricle in a similar 

 way. Its wall has a similar appearance. Notice the parti- 

 tion or septum which divides one auricle from the other ; in 

 one part this is very thin. Gently wash away any clots of 



FIG. 40. The right side of the heart of a sheep laid open. 



KA, right auricle; K V, right ventricle ; S.V.C, superior vena cava ; fl'C, inferior 

 vena cava ; a bristle is passed through each of tfiese ; /r>, two of the three flaps 

 of the tricuspid valve, the third is dimly seen behind them. Between the flaps 

 chords tendiue^ are seen proceeding to a papillary muscle, //, which is shown 

 cut away from the wall of the ventricle. /*.'!, pulmonary artery ; sv, one of the 

 three pockets of the semilunar valve, i, The wall of the right ventricle ; 2, the 

 ring between the auricle and ventricle, with a, a bristle passed through the open- 

 ing > 3. wa " of the right auricle ; 4, fat lying between the auricle and pulmonary 

 artery ; />, a bristle passed into the coronary vein. 



blood there may be. Look down into the right ventricle ; at 

 first sight there does not seem to be anything separating it 



