146 ANATOMY AND PHYSIOLOGY FOR NURSES 



In their superior portion the lungs receive the trachea 

 or windpipe, which divides into the bronchi, one of which 

 goes to the right lung and the other to the left. These 

 bronchial tubes continue to divide and branch off in the 

 parenchymatous substance of the lungs until they become 

 extremely minute in their ultimate attenuation. The 

 lungs, like the heart, are conic in shape. Fig. 70 will 



Larynx. 



Right common 

 carotid artery. 



Subclavian 

 arteries. 



Innominate 

 artery. 



Arch of aorta. 

 Right lung. 



Superior vena 

 cava. 



Right auricle. 



Left lung. 



Pulmonary 

 artery. 



Heart. 



Coronary 

 artery. 



FIG. 70. Relation of lungs to other thoracic organs (Ingals). 



give some idea of the shape of the lungs and the position 

 of the heart; it will also serve to illustrate the arrange- 

 ment by which the blood and the air in the lungs become 

 exposed by contact. 



The substance of the lungs is of exceedingly light and 

 spongy texture, being made up of air-cells, vessels, and 

 tubes with their delicate walls. The color of the lungs 

 varies with the age of the subject, being a light pinkish- 

 red in youth, and becoming darker, purplish, or mottled 



