DISSECTION OF LARYNX. 321 



those used by dentists) may be inserted through the mouth so 

 that the larynx can be seen from above. But the meaning of 

 what would be thus seen would not be very clear without a 

 careful dissection of the larynx. 



The Larynx of the Calf. 1. The front of the larynx is 

 readily distinguished by the projection of cartilage known as 

 the Adam's Apple. 



2. Along the back of the larynx runs a thick muscular 

 tube, the Gullet, with a whitish lining, the mucous membrane. 



3. Trim away the muscles and other tissues from the front 

 and sides of the larynx. The large cartilage forming the 

 greater part of the front of the larynx is the Thyroid Car- 

 tilage. 



4. Observe the band of muscles attached to either side of 

 the thyroid cartilage and passing horizontally back around the 

 esophagus. 



Cut away this muscle as completely as possible, and entirely 

 remove the gullet. Note that the whitish or yellowish Mucous 

 Membrane which lines the gullet is continuous with the lining 

 of the larynx. Study now more fully the shape of the thy- 

 roid cartilage. 



5. Back of the upper part of the thyroid cartilage, cover- 

 ing the upper end of the larynx, is the arched Epiglottis. Feel 

 of it to learn its consistency. Press it upward and forward, 

 then downward and backward; observe that it now covers 

 the entrance to the larynx ; note the position it takes when 

 released. 



. 6. Just back of the upper angle of the thyroid cartilage 

 find a muscle connected with the base of the epiglottis ; pull 

 this muscle to determine what effect its shortening produces 

 on the epiglottis. 



7. Under the thyroid cartilage in front observe a narrow 

 ring of cartilage not much wider than one of the rings of the 



