J 844 



HUMAN ANATOMY. 



Groove for subclavian 

 artery 



Groove for 

 innominate vein 



Superior 

 lobe 



Anterior 

 border 



•Middle 

 lobe 



Base 

 Inferior lobe 



Right lung, hardened in situ ; antero-lateral aspect. 



causing the expansion which makes the outUne triangular, the inferior vein being in the 

 lower angle. The inner surfaces are also marked by certain adjacent structures which 

 require a separate account for each lung. 



The right lung presents a vertical groove Fig. 1 564. 



above and in front for the superior vena Apex 



cava, and one for the vena azygos major, 

 which is distinct behind the upper part 

 of the hilum and above it where this 

 vein runs forward to the cava. The right 

 subclavian artery, owing to its high origin 

 from the innominate, indents but little of 

 the internal surface. A more or less 

 marked vertical groove for the oesophagus 

 is seen behind the hilum and below that 

 for the azygos. There is also a groove 

 below on the inner surface where the in- 

 ferior vena cava turns forward to enter the 

 heart. A slight impression made by the 

 trachea may also be present near the 

 apex. The inner surface of the left lung 

 is deeply grooved by the aorta arching 

 over the root and descending behind it, 

 the imprint growing faint and disappear- 

 ing at the lower end. The left carotid 

 and subclavian arteries make distinct 

 impressions at the upper part diverging 

 from the aortic groove. 



The base (fades diaphragmatica) is 

 concave, that of the right one being 



rather the more so. Both are semilunar in outline, owing to the part cut out 

 of them by the heart ; since this encroachment is greater on the left, the base 



of that lung is a narrower 

 Fi<^- 1565- crescent. 



The inferior border 

 surrounds the base. The 

 latter forms about a right 

 angle with the internal sur- 

 face, but at the periphery, 

 especially at the back and 

 at the side, a sharp edge 

 of lung is prolonged down 

 into the narrow space be- 

 tween the diaphragm and 

 the thoracic walls. The 

 anterior border is sharp 

 and somewhat irregular, 

 often presenting a series of 

 convexities. Starting near 

 the apex, it descends on 

 both lungs with a forward 

 curve, which is most promi- 

 nent in the upper part, so 

 that the lungs nearly or 

 quite meet behind the ma- 

 nubrium. The anterior bor- 

 der of the right lung then 

 inclines downward and out- 

 ward so as to meet the inferior border in a gradual curve. On the left this convex- 

 ity is changed into a sharp concavity where the border curves outward around the 



Groove for 

 innominate artery 



Groove for right 

 innominate vein 



<Jroove for 

 vena cava 

 superior 



Secondary- 

 bronchus 

 Branches of, 

 pulmonary 

 artery 



Cardiac 

 impression 



Inferior pul- 

 monary vein 



Groove for 

 vena azygos major 



ain bronchus 



Ligamentum 

 latum 



'^-j>- 



Diaphragmatic surface 



Preceding lung ; median aspect. 



