MANUAL FOR STABLE SERGEANTS. 29 



three i^assages by the turbinated bones. The sense of smell is located 

 at the back of the nasal chambers. 



51. The pharynx is an elongated cylindrical muscular cavity 

 common to the respiratory and digestive tracts. It lies just back of 



Fig. 14.— Respiratory apparatus. 3, Nasal chamber; 4, tongue; 5, pharynx; 6, larynx; 

 7, epiglottis, or potlid; 8. trachea, or windpipe: 9, Esophagus, or gullet; 10, section 

 of left bronchus; 11, ramifications of the right bronchus; 12, right lung; 13, left lung, 

 seen from above; 14, sternum; 15^ ribs; 15a, section of the left ribs; 16, heart; 17, 

 posterior aorta (cut off); 18, anterior aorta (cut off). 



the mouth, above the larynx, and is continued backward by the 

 esophagus. 



52. The larynx is a muscular, cartilaginous^box, situated in the 

 back part of the maxillary space. It has an anterior opening into 

 the pharynx and a posterior one into the trachea, with which it is 



