ROARING. 



139 



Mr. James Turner has found that roaring has been produced 

 by enlargement of the turbinated bones of the nostrils, but we 

 imagine it is not a frequent cause. 



Fig. 5. 



Mi\\\\m\r% 

 Fiy. 3. 



These figures are tiiken from three 

 cases of roaring. The upjier and 

 posterior part of the larynx is shown 

 in each. 

 In fig. 3. the roaring is produced by 

 contraction of the windpipe, which 

 may be seen by comparing it with 

 the others : this is not a frequent 

 cause of roaring. 



a the cricoid cartilage. 



h the arytenoid. 



c the epiglottis. 



d the windpipe. 

 Fig, 4. A case of roaring from inflam- 

 mation and ulceration of tlie glottis 

 and epiglottis. This case is not 

 imfrequent, thougli it seldom exists 

 in such a formidable extent : it pro- 

 ceeds from repeated sore throats, 



and is generally attended with a 

 cough. 



Fig. 5. sliows a case of roaring from 

 absorption and want of power in the 

 muscles which open the glottis on 

 one side (here the left), so that there 

 is an obstruction to the jiassage of 

 the air. Instances of this descrip- 

 tion are not unfrequent; they are 

 usually not very severe, and often 

 manifested only when the horse 

 makes great exertion : there is no 

 cough. 



It is now supposed that the attenu- 

 ation of the muscles is an effect and 

 not a cause, being thrown out of 

 use from an affection of the nerves 

 which supply the part. 



It has been found also that roaring has been produced by a 

 diseased affection of the recurrent nerves; and we not unfre- 

 quently find, on dissecting the windpipe of roarers, that the 

 muscles that assist in opening the glottis present the appearance 

 represented in our cut {Jig. 5.), the muscles on one side being 

 powerless, and almost absorbed. It is, however, a matter of 

 dispute, whether in these cases this appearance of the muscles 

 is a cause or a consequence of roaring. Some contend that the 



