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EXPLANATION OF PLATE I. 

 FORE AND BACK VIEWS OF THE HEART. 



FIG. I. 



A. view of the Heart and its Great Vessels, nearly in the Situ- 

 ation iri which it is seen when the Breast is opened. 



A. The Superior Vena Cava, returning the blood from the head and arms. 



B. The Inferior Cava, tied where it pierces the diaphragm to convey the 



blood from the lower parts of the body into the right auricle, 

 c. The Right Sinus, or Auricle. 



D. The Right Ventricle. 



E. The Pulmonary Artery ; it is seen to divide ; one branch to pass, under 



the arch of the aorta, to the lungs of the right side ; the other to take 

 an acute turn to those of the left side. 



F. The top of the Left Sinus of the Heart, or that which is properly the auricle. 



G. The Left Ventricle; it is seen Fig. II. A. 

 H. The Arch of the Aorta. 



i. The Subclavian and Carotid of the right side, rising together from the Aorta. 

 K. The Carotid Artery of the left side. 

 L. The Subclavian Artery of the left side. 

 M. A Branch of the Right Coronary Artery. 

 N. The Left Coronary Vein. 



0. A Branch of the Coronary Vein. 



FIG. II. 



The Posterior Surface of the Heart, and the vessels given off 

 on the side next the Spine are seen in this view. 



A. The Left Ventricle of the Heart. 



B. The Trunk of the Pulmonary Artery. 



c. The Right Branch of the Pulmonary Artery. 



D. The Left Branch of the Pulmonary Artery. 



E. The Buds of the Pulmonary Veins of the left side entering the left sinus 



of the heart. 



F. The Pulmonary Veins of the right side. 



G. The Vena sine Pari, or Azygos ; this vein lies upon the spine, collects 



the blood from the back part of the thorax, and conveys it to the supe- 

 rior vena cava. 

 H. The Superior Vena Cava. 



1. The Aorta where it first touches the Spine. 

 L. The Left Carotid Artery. 



M. The Left Subclavian Artery. 



N. The Arteria Innominata, or common origin of the subclavian and carotid 

 of the right side. 



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