48 THORAX 



phrenico-costal sinus of the pleura, which intervenes between 

 the diaphragm and the wall of the thorax. The lateral and 

 posterior parts attain a somewhat lower position than the 

 anterior part, but in all parts fall considerably short of the 

 bottom of the sinus. The mediastinal part of the inferior 

 margin, which lies along the lower border of the pericardium, 

 is more rounded. 



Groove for arch of aorta. 



Left pulmonary artery 



Upper left 



pulmonary vein 



Left bronchus 



Lower left 

 pulmonary vein 



Pulmonary 

 ligament 



Groove for 

 oesophagus 



roove for left subclavian artery 

 Groove for left innominate vein 



Groove for first rib 



Groove for thymus 

 and areolar tissue in 

 mediastinum 



Groove for con us 

 arteriosus 



Depression for 

 left ventricle 



Cardiac notch 



FIG. 1 8. The Medial Surface of a Left Lung hardened i 



in situ. 



The diaphragm separates the base of the right lung from 

 the upper surface of the right lobe of the liver, and the base 

 of the left lung from the left lobe of the liver, the stomach, 

 the spleen, and, in some cases, from the left extremity of the 

 transverse colon. 



The costal surface of the lung is very extensive and convex. 

 It lies in relation with the costal pleura, which separates it 

 from the ribs and intercostal muscles, the transversus thoracis 



