314 



THE HEART. 



left ventricle extends from the second left intercostal space to a point in the 

 fifth space placed two inches vertically below the nipple. The sharp margin 

 formed by the right ventricle passes from the sternal end of the fifth right 

 costal cartilage, and crosses behind the end of the body of the sternum and 

 the sixth left costal cartilage, to meet the other margin at the apex. 



Fig. 235. 



Fig, 235. SEMI-DIAGRAMMATIC REPRESEKTATION OF THE CHEST, WITH THE INTERCOSTAL 



SPACES DISSECTED IN FRONT TO SHOW THE POSITION OF THE HEART AND GREAT 



VESSELS, AS SEEN BEHIND THE STERNUM AND COSTAL CARTILAGES (from Luschka and 



A. Thomson). 



a, right clavicle ; b, scalenus anticus muscle ; c, sterno-mastoid muscle divided ; c7, pec- 

 toral muscles divided ; + , axillary nerves above the subclavian artery ; e, trachea below the 

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

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

 left lobe of the liver ; i } stomach ; &, k, transverse colon ; I, to X, first to tenth ribs near 



