210 



THE DOG IN DISEASE. 



ventilation of the blood pass, and extends from the nos- 

 trils to the air-cells. 



Briefly, the tract consists of a mucous membrane cov- 

 ered with epithelial cells, abounding in blood-vessels and lin- 



FiG. 12.— Lungs, Anterior View (Sappey). 

 1, upper lobe of left lung ; 2, lower lobe ; 3, fissure ; 4, notch corresponding to 

 apex of heart ; 5, pericardium ; 6, upper lobe of right lung : 7. middle lobe ; 

 8, lower lobe ; 9, fissure ; 10, fissm'e ; 11, diaphragm ; 12, anterior mediasti- 

 num ; 13. thyroid gland ; 14, middle cervical aponeurosis ; 15, process of at- 

 tachment of mediastinum to pericardium ; 16, 16, seventh ribs ; 17, 17, trans- 

 versales muscles ; 18, linea alba. Though this cut refers to the human sub- 

 ject, the relations of parts are substantially the same in the dog. 



ing the nose, back of the throat, the voice box {larynx)^ the 

 wind-pipe {trachea)^ its subdivisions {pronchi\ and blend- 



