DISSECTION OF THE DOG 45 



intermediate lobe, there is a broad groove f<»r the oesophagus. The intermediate 

 lobe itself forme a prominent, pointed projection <>n the Burface. Sometimes 



the cardial- depression is crowed by a narrow, shallow groove caused by the 



liu'ld phrenic nerve. 



The dorsal or obtu» border (margo obtusos) of the lung is adapted to the 

 channel formed by the ribs and the vertebrae, and consequently is thin at the 

 apex, bul becomes (hick and rounded towards the base of the organ. 



The ventral or acvJU border (margo acutus) i> much shorter and thin 



a 

 i 



1 9 



I y O 



Lob us <S 



dia phra gm abicus *« 



6 





I 



I 



i 





! 

 i 

 i 



Lob us ' 



cardiac us Lob us » 



, apical is \ 



l ' Apex pulmonis 



i 



I 

 Faciei diaphra-jmatica Mar/go a C u. C u s 



i 

 c 



Fii:. 18. — Medial surface of the left lung, a, Groove for aorta ; b, groove for phrenic 

 nerve; c, depression for heart. 1, Bronchial rami for apical and cardiac lobes; 2, 

 bronchial ramus for diaphragmatic lobe; 3, pulmonary artery; 4, pulmonary vein of 

 apical lobe ; 5, pulmonary vein of cardiac lobe ; 6, pulmonary vein of diaphragmatic lobe. 



throughout. It occupies the narrow space (sums costo-raediastinalis) between 

 the ribs and the mediastinal septum, and is notched for the accommodation of 

 the heart (incisura cardiaca). The cardiac notch is much deeper in the right 

 lung than it is in the left ; consequently more of the heart is uncovered bi- 

 lling on the right side of the chest than on the left. 



The apex (apex pulmonis) of the lung is free, blunt, and laterally flattened. 

 The base (basis pulmonis), being applied to the diaphragm, possesses a concave 

 surface (facies diaphragmatica) which slopes in a caudal and lateral direction. 



