46 



ELEMENTARY PHYSIOLOGY 



papillary muscles (Figs. 16 and 17, pp) ; similar 

 column-like elevations of the walls of the ventricles, but 



RioHT 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 style has been passed through each of these ;) a, a style 

 passed from the auricle to the ventriulo through the auriculo-ventricular 

 orifice ; 6, a style passed into the eonmary vein. 



R. F. cavity of right ventricle ; ti\ tv, two flaps of the tricuspid valve ; 

 tlie third is dimly seen behind thoni, the style <i passing between the 

 three. Between the two flaps, and attached to them by chordce tendinfce, 

 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 ventricle terminates somewhat like a fiumel in the pulmonary 

 artery, P. A. One of the pockets of the semiliuiar valve sv, is seen in its 

 entirety, another partially. 



1, 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 

 between the auricle and pulmonary artery. 



