CIRCULATION.] 



PHYSIOLOGY. 



67 



can put your three fingers. This is the opening into 



AV'C 



Fig. 8. — Right Side of the Heart of a Sheep. 



R.A. cavity of right auricle ; ^S". V.C. superior vena cava, /. V.C. inferior 

 vena cava ; (a piece of whalebone has been passed through each of these ;) 

 a^ a piece of whalebone passed from the auricle to the ventiicle through the 

 auriculo-ventricular orifice ; b, a piece of whalebone passed into the coro- 

 nary vein. 



R. V. cavity of right ventricle ; iv, tv, two flaps of the tricuspid valve : 

 the third is dimly seen behind them, the a, piece of whalebone, passing 

 between the three. Between the two flaps, and attached to them by chordep 

 tendineie, is seen a papillary muscle, PP, cut away from its attachment to that 

 portion of the wall of the ventricle which has been removed. Above, the ven- 

 tricle terminates somewhat like a funnel in the pulmonary artery, P. A . One of 

 the pockets of the semilunar valve, sv, is seen in its entirety, another partially. 



I, the wall of the ventricle cut across ; 2, the position of the auriculo- 

 ventricular ring ; 3, the wall of the auricle ; 4, masses of fat lodged betweex) 

 the auricle and pulmonary artery. 



F 2 



