THE HEART. 



Fig. 174. 



Fig. 174. — Semi-diagrammatic representation op the Chest, to show the position 

 OF the Heart and Great Vessels, as seen behind the Sternum and Costal 

 Cartilages (from LuscLka and A. Tliomson). One-fourth the natural size. 



The lungs have slirunk from tlie front of the cliest. The heart is slightly higher 

 than dui'ing life, and the aorta more to the right, a, right clavicle ; b, scalenus 

 anticus mnscle ; c, sterno-mastoid mnscle divided ; d, pectoral muscles divided ; 

 + , axillary nerves above the subclavian artery ; c, trachea below the isthmus of the 

 thyroid body ; /, /, upper surface of the diaphragm ; g, g, surface of the lungs ; 

 g', on the left side, apex of the lung or pleura appearing in the neck ; h, right, 

 A', left lobe of the liver ; i, stomach ; k, h, transverse colon ; I, to X, first to tenth ribs 

 near their cartilages ; 1, placed on the lower part of the manubrium of the sternum, and 

 on the place of the arch of the aorta indicated by dotted lines ; 2, 'placed in the second left 

 intercostal space, on the stem of the pulmonary artery ; 3, appendix of the right auricle ; 

 3', on the sinus venosus, behind the third space ; 3", its lower part at the junction of 

 the sixth and seventh right costal cartilages with the sternum ; 4, left auricular appendix ; 



