

PHYSIOLOGY : PRACTICUM V : PLATE XII. 

 THE SHEEP'S HEART. 



VENTRUM. 

 BASE 



P. L. 



AX 



-- A. V. L. 



Ventrum. The upper figure is an outline 

 diagram of the ventral ( "front" ) and more 

 familiar aspect of the heart after the re- 

 moval of the pericardium, the attachment 

 of which is indicated by the double line. 

 The arteries (aorta, its main branch, B, and 

 pulmonary artery) are distinguished by the 

 transverse lines at the margins. On the 

 right auricle the curved interrupted line 

 A-U indicates the first incision for opening 

 the cavity. On the right ventricle the lines 

 connecting C D and E indicate the incisions 

 for removing a triangular area without cut- 

 ting the moderator band ; the line E H en- 

 ables the intervening flap to be raised. On 

 the pulmonary artery the broken line 

 bounds the area to be cut out in order to 

 show the valves. 



Az. the Azygous vein. P. L., the peri- 

 cardial line. A. V. L., the auriculo-ventric- 

 ular line. 



Dorsum. This, the dorsal aspect, is much 

 too heavily shaded. The word azygous is 

 placed on what is really the CORONARY 

 SINUS. The words PRECAVA and PUL- 

 MONARY VEIN are written on a mass of 

 fat and lung tissue remaining attached to 

 the preparation. At the left Az. indicates 

 the cut end of the (left) AZYGOUS VEIN. 

 L. A., part of the LEFT AURICLE. A, 

 AORTA. B, its first great branch. 



The RIGHT AURICLE should be crossed 

 obliquely by a furrow, from the root of the 

 azygous vein through the R of AURICLE 

 and the G of RIGHT to the emargination at 

 the root of the precava ; this emargination 

 should be more distinct, as a notch. The 

 furrow is the SULCUS TERMINALIS, de- 

 marcating the ATRIUM, into which the 

 veins empty, from the APPENDIX. The 

 broken white line is continuation of the 

 line A U on the Ventrum. 



