CHAPTER FIFTH. 



PNEUMONOLOGY, OR HISTORY OF THE ORGANS OF BREATHING. 

 — THE RESPIRATORY, VOCAL, AND CALORIFIC ORGANS. 



DEFINITIONS AND DESCRIPTIONS. 



435. Location of Respiratory Organs —Sympathy be- 

 tween the Heart and Lungs. — Within the thorax are con- 

 tained not only the central organs of circulation, but other 

 organs closely related, and connected with them, the Respira- 



Fig. 246. 



r) t rj 



od vc vd a vg 



Lungs, Heart, and Principal Vessels in Man. od. Right Auricle, vd. Right 

 Ventricle, vg. Left Ventricle, a. Aorta, ao. Carotid Arteries, vc. Vena Cava. 

 t. Trachea, vj, Jugular Veins. 



4-35. What organs are contained in the thorax? What is said of the sympathy be- 

 tween the respiratory and circulate ry organs? 



