86 



Roaring in Horses. 



lower opening, or infra-glottic division (Fig. 3, 4), is 

 formed by the cricoid cartilage, which circumscribes it ; it 

 is continuous with the tracheal lumen, and measures 1-J inch. 



Fig. 3. — interior of left side of the hokse's larynx. 



1, Supra-glottic or upper portion of the laryngeal cavity. 2, 3,|Glottis 

 or middle division. 4, Sub-glottic or lower portion. 2, Commencement 

 of thenars vocales. 3, Commencement of ^ars resplratoria. a, Thyroid 

 cartilage, h, Arytenoid cartilage, with c, its appendix — the cartilage 

 of Santorini. d, Posterior or bezel portion of the cricoid cartilage. 

 e, Anterior portion of cricoid cartilage. /, Vocal cord with entrance 

 to vocal ventricle (sacculus Iwyngis) immediately above it. g, Epiglottis. 

 h, Basal process oJE epiglottis, i, Sub-epiglottic sinus, j, Ary-epiglottic 

 fold of mucous membrane, k, Vocal band above the ventricle. 



the rings of the trachea measuring from li to 2 inches in 

 diameter. 



The middle or glottic division — the glottis, glottis vera, 

 or, better, rima glottidis — is the most important of the 



