General Management in Disease 



larynx, which undergo fatty degeneration, but 

 whether the fatty degeneration is primary or 

 secondary is open to doubt. The recurrent 

 nerve is implicated, as it supplies motor power to 

 the muscles of the larynx. A morbid growth 

 in the nasal chamber, such as a bony tumour (or a 

 polypus), sometimes causes continuous roaring, 

 whilst a stalked tumour growing in juxta-position 

 to the larynx, may pass over the glottal opening, 

 occlude it, and produce the roaring sound. 

 With an alteration in the position of the growth, 

 the sound may disappear. Lead-poisoning, and a 

 species of Indian Vetch occasionally produce a 

 similar sound. In short, mechanical obstructions 

 in any part of the air-tube, may give rise to 

 roaring. 



Strangles, in exceptional cases, is succeeded by 

 roaring. 



A roarer is of slight commerical value, there 

 being no cure for it (if due to disease of the 

 laryngeal muscles), but many horses continue to 

 do useful work with a tube in their throat. 



Ruptures 



A rupture consists of the displacement of an 

 organ, or. tissue from its normal position. The 

 commonest rupture in the horse is at the navel, 

 and is called " Umbilical." This animal sometimes 

 suffers from "scrotal" rupture, in which a portion 



123 



