CHAPTER XII 



THE EESPIRATORY SYSTEM 



The respiratory system may be said to comprise a true respiratory 

 organ, the pulmonary alveoli, in which the interchange of gases between 

 the air and the blood occurs, and a system of duct-like passages leading 



Superior turbinate bone 



Olfactory nerve 



Fronlal sinus 



Nasal sinus 



Mid. turbinate 



Mid. mttatus 



Inf. turbinate 



Sphenoidal sinus 

 Nasal nerve 



Auditory tube opening 



Hypoylossal nerve 



Larynx 

 Thyroid cart. 



Cricoid cart. 



Trachea 



Anterior pillar 



Tonsil 



Uvula 



'ost. pillar of fauces 

 Pharynx 



Epiglottis 

 Ventricle 



Vocal cords 

 Esophagus 



FIG. 280. PHOTOGRAPH OF Azoux MODEL, SHOWING NOSTRIL, PHARYNX, LARYNX 



AND RELATED STRUCTURES. 

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