DISSECTION OP THE DOG 



43 



Lobi pulmonis. — Deep fissures, cutting the substance of the organ to its 

 root, divide each lung into lobes. The left lung is completely divided into 

 two parts, of which the more cranial is, in its turn, partially, subdivided. The 

 completely isolated lobe is basal in position and is related to the diaphragm — 

 the diaphragmatic lobe (lobus diaphragmaticus). The imperfectly separated 

 lobes may be known as apical (lobus apicalis) and cardiac (lobus cardiacus) 

 from their position and relations. 



alb* 



s v> $ 



Apex pulmonis 





Fig. 16. — Medial surface of the right lung, a, Groove for cranial vena cava ; b, groove for vena azygos ; 

 c, groove for oesophagus ; d, groove for phrenic nerve ; e, groove for internal mammary artery ; /, depression 

 for heart. 1, Bronchial ramus for apical lobe ; 2, bronchial ramus for diaphragmatic and intermediate 

 lobes ; 3, bronchial ramus for cardiac lobe ; 4, branch of pulmonary artery for cardiac, diaphragmatic, and 

 intermediate lobes ; 6, branch of pulmonary -artery for apical lobe ; 6, 7, 8, pulmonary veins of apical lobe ; 

 9, pulmonary vein of cardiac lobe ; 10, pulmonary vein of diaphragmatic and intermediate lobes. 



The right lung has apical, cardiac, and diaphragmatic lobes completely 

 separated from each other, and, in addition, an intermediate lobe (lobus inter- 

 medius) occupying the space between the diaphragmatic lobes of the two lungs, 

 the heart, and the diaphragm. The intermediate lobe is irregularly pyramidal, 

 with its base applied to the diaphragm. At its ventral angle there is a deep, 

 rounded notch, in which are lodged the caudal vena cava, the right phrenic 

 nerve, and the fold of pleura associated with these structures. 



The lateral or costal surface (facies costalis) of each lung is smooth and 

 glistening from the presence upon it of visceral pleura. Being applied closely 



