THE RESPIRATORY SYSTEM. 



367 



organ) may be compared to a single infundibulum of the mam- 

 malian lung. 



Assuming that the student is somewhat conversant with the 

 coarse and fine anatomy of the respiratory organs, we call at- 



Fio. 289. — Lungs, anterior view (Sappey). 1, npper lobe of left lung; 2, lower lobe; 3, 

 fiBsure; 4, notch corresponding to apex of heart; 5, perietirdium; 6, upper lobe of 

 right lung; 7, middle lobe; 8, lower lobe; 9, fiesure; 10, fissure; 11, diaphragm; 

 12, anterior mediastinum; 13, thyroid gland; 14, middle cervical aponeurosis; 15, 

 process of attachment of mediastinum to pericardium; 16, 16, seventh ribs; 17, 17. 

 transversales muscles; 18, linea alba. 



tention to the physiological aspects of some points in their 

 structure. The lungs represent a membranous expansion of 



