488 MUSCLES OF THE LARYNX. 



tirytenoid ligaments, or chordce vocales, are thicker than the superior, and 

 like them composed of elastic tissue. Each ligament is attached in front 

 to the receding angle of the thyroid cartilage, and behind to the anterior 

 angle of the base of the arytenoid. The interior border of the chorda vo- 

 calis is continuous with the lateral expansion of the crico-thyroid ligament. 

 The superior border forms the lower boundaiy of the ventricle of the la- 

 rynx. The space between the two chorda vocales is the glottis or rima 

 glottidis. 



4. The ligaments of the epiglottis are five in number, namely, three 

 glosso-epiglottic, hyo-epiglottic, and thyro-epiglottic. 



Fig 215* '^ ne gl oss - e piglttic ligaments (frama epiglottidis) 



are three folds of mucous membrane, which connect 

 the anterior surface of the epiglottis with the root of 

 the tongue. The middle of these contains elastic tis- 

 sue. The hyo-epiglottic ligament is a band of elastic 

 tissue passing between the anterior aspect of the epi- 

 glottis near its apex, and the upper margin of the body 

 of the os hyoides. The thyro-epiglottic ligament is a 

 long and slender fasciculus of elastic tissue, which 

 embraces the apex of the epiglottis, and is inserted 

 into the receding angle of the thyroid cartilage imme- 

 diately below r the anterior fissure and above the attach- 

 ment of the chordae vocales. 

 Muscles. The muscles of the larynx are eight in number: the five 

 larger are the muscles of the chorda? vocales and rima glottidis ; the three 

 smaller are muscles of the epiglottis. 



The five muscles of the chorda? vocales and rima glottidis are the 



Crico-thyroid, 



Crico-arytenoideus posticus, 

 Crico-arytenoideus lateralis, 

 Thyro-arytenoideus, 

 Arytenoideus. 



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

 cartilage, and passes obliquely outw r ards and backwards to be inserted 

 into the lower and inner border of the ala of the thyroid as far back as its 

 inferior cornu. 



The Crico-arytenoideus posticus arises from the depression on the pos- 

 terior surface of the cricoid cartilage, and passes upwards and outwards 

 to be 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 passes upwards and backwards to be inserted into 

 the outer angle of the base of the arytenoid cartilage. 



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

 cartilage, close to the outer side of the chorda vocalis, and passes back- 

 wards parallel with the cord, to be inserted into the base and outer surface 

 of the arytenoid cartilage. 



* A posterior view of the larynx. 1. The thyroid cartilage, its right ala. 2. One of 

 us ascending cornua. 3. One of the descending cornua. 4, 7. The cricoid cartilage. 

 5. 5. The arytenoid cartilages. 6. The arytenoideus muscle, consisting of oblique and 

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



