336 



HEAD AND NECK 



which is thin and firmly bound down to the ligament. Em- 

 bedded in its anterior extremity there is a minute nodule of 

 condensed elastic tissue, called the sesamoid cartilage. 



Dissection. By removing the mucous membrane in the 

 region of the rima glottidis and the laryngeal ventricle a good 

 view of the parts which bound the rima will be obtained 

 viz., anteriorly, the angle of the thyreoid cartilage ; posteriorly, 

 the arytaenoideus trans versus muscle ; on each side, the vocal 



ligament, the 



Arytaenoid cartilage P r . C e S S U S 



vocalis, and the 

 medial surface 

 of the arytaen- 

 oid cartilage 

 (P- 343). They 

 are all clothed 

 with the lining 

 mucous mem- 

 brane of the 

 larynx. 



Muscular process of 

 arytaenoid cartilage 



Vocal process of 

 arytaenoid cartilage 



Rima glottidis 



Vocal ligament 

 Lateral part of 

 conus elasticus 

 Facet for inferior 

 cornu of thyreoid 

 cartilage 

 Cricoid cartilage 



FiG. 126. Conus elasticus. The right lamina of 

 the thyreoid cartilage, etc., have been removed. 



Ligamentum 

 Ventriculare. 

 The feeble ven- 

 tricular ligaments 

 support the ven- 

 tricular folds. 

 Each is weak and 

 indefinite, but 

 somewhat longer 

 than the corre- 

 sponding vocal 

 ligament. Anteriorly, each ventricular ligament is attached 

 to the angular depression between the two laminae of the 

 thyreoid cartilage, above the vocal fold and immediately below 

 the attachment of the thyreo-epiglottic ligament ; and it 

 extends backwards to a tubercle on the lateral surface of the 

 arytaenoid cartilage above the processus vocalis. It is com- 

 posed of connective tissue and elastic fibres, which are con- 

 tinuous with the fibrous tissue in the ary-epiglottic fold. 



Dissection. Remove the remains of the ary-epiglottic fold, 

 the ventricular and the vocal folds, and the lateral part of the 

 conus elasticus, on the left side of the larynx, but be careful not 

 to injure the arytsenoid cartilage or the corniculate cartilage. 

 If the cuneiform cartilage is present in the ary-epiglottic fold 

 it should be detached and preserved. By this dissection a good 

 view of the side wall of the laryngeal cavity can be obtained. 



