532 



RESPIRATORY SYSTEM OF THE HORSE 



curved part of the groove for the aortic arch is absent on the right lung, on which 

 there is a groove for the vena azygos. Anteriorly there are grooves for the trachea, 

 the brachiocephahc trunk, the anterior vena cava, and other vessels. 



JJorsal horcle. 



Fig. 47.'>. — Left Luxg of Hohre; Costal Surface. 

 Specimen hardened in situ. 



Pulmonary 



Groove for artery Bronchus 



anterior c.d. \ \ Groove for vena azygos 



vt'ita caea j\ i ' ' \ 



Cr-ooue '^°^°°'~^'L 



Area of 



Ligament of lung {cut) 





'5;^sfr5.rf<. 



hf^^ 



fe^JA"/ 



bO 



rd 



er 



Line of reflection of pleura 



Fig. 474. — Right Luxg of Horse; Mediastinal and Diaphragmatic Surfaces. 

 Organ hardened in situ. c. d, Grooves for deep cervical and dorsal veins. Arrows indicate canal for posterior 

 vena cava between intermediate lobe and main part of lung. By an oversight the impression of the trachea is un- 

 marked; it is dorsal to the groove for the vena cava. 



The dorsal border (Margo dorsaUs) is long, thick, and rounded; it lies in the 

 groove alongside of the bodies of the thoracic vertebrEe."^ 



1 In some cases this border is cut into by a fissure which partly marks off the apex from the 

 body of the lung. 



