482 



LARYNX. 





are the muscles of the chordae vocales and rima glottidis ; the three 

 smaller are muscles of the epiglottis. 



The five muscles of the chordse vocales and rima glottidis are 

 the 



Crico-thyroid, 



Crico-arytenoideus posticus, 



Crico-arytenoideus lateralis, 



Thyro-arytenoideus, 



Arytenoideus. 



Fig. 145 * 



Fig. 146.t 



The Crico-thyroid muscle arises from the anterior surface of the 

 cricoid cartilage, and is inserted into the lower and inner border of 

 the thyroid. 



The Crico-arytenoideus posticus arises from the depression on the 

 posterior surface of the cricoid cartilage, and is inserted into the 

 outer angle of the base of the arytenoid. 



The Crico-arytenoideus lateralis arises from the upper border of 

 the side of the cricoid, and is inserted into the outer angle of the 

 base of the arytenoid cartilage. 



The Thyro-arytenoideus arises from the receding angle of the thy- 

 roid cartilage, close to the outer side of the chorda vocalis, and 

 passes backwards parallel with the chord, to be inserted into the 

 base of the arytenoid cartilage. 



The Jlrytenoideus muscle occupies the posterior concave surface 

 of the arytenoid cartilages, between which it is stretched. It con- 



* A posterior view of the larynx. 1. The thyroid cartilage. 2. One of its ascend- 

 ing cornua. 3. One of the descending cornua. 4. 7. The cricoid cartilage. 5, 5. The 

 arytenoid cartilages. 6. The arytcnoideus muscle, consisting of oblique and trans- 

 verse fasciculi. 7. The crico-arytenoidei postici muscles. 8. The epiglottis. 



t A side view of the larynx, one ala of the thyroid cartilage has been removed. 

 1. The remaining ala of the thyroid cartilage. 2. One of the arytenoid cartilages. 

 3. One of the cornicula laryngis. 4. The cricoid cartilage. 5. The crico-arytenoideus 

 posticus muscle. 6. The crico-arytenoideus lateralis. 7. The thyro-arytenoideus. 

 8. The crico-thyroidean membrane. 9. One half of the epiglottis. 10. The upper 

 part of the trachea. 



