THE LARYNX 417 



for the superior aperture of the larynx. Each bundle 

 starting from the base of one of the arytaenoid cartilages 

 is prolonged into the ary-epiglottic fold of the opposite 

 side, and along this to the margin of the epiglottis. 



The arytanoideus transversus is an unpaired muscle. It is 

 composed of transverse fibres which bridge across the interval 

 between the two arytaenoid cartilages, and are attached to 

 the posterior aspect of the lateral border of each arytaenoid 

 cartilage. Many of the fibres turn round the arytaenoid 



Epiglottis 

 Small cornu of hyoid bone 



Body of hyoid bone 



*f \ 



I 



Lamina of thyreoid '_/ 

 cartilage 9 



Musculus vocalis 



Lateral crico-arytaenoid -;- 



Posterior crico-arytaenoid - 

 Crico-thyreoid ligament - 



I 



Trachea -S 



Sr 



FIG. 163. Lateral view of the Muscles of the Larynx. The fibres passing 

 postero-superiorly from the upper border of the musculus vocalis are the 

 fibres of the thyreo-epiglotticus. They blend above with the ary- 

 epiglotticus. 



cartilage and become continuous, on each side, with the fibres 

 of the thyreo-arytaenoid muscle. 



Dissection. The further dissection of the laryngeal muscles should be 

 confined to the right side of the larynx. The left side should be reserved 

 for the study of the nerves and vessels. Place the larynx on its left side, 

 and, having fixed it in this position, remove the right crico-thyreoid muscle. 

 The right lateral part of the thyreo-hyoid membrane should next be divided, 

 and the right inferior cornu of the thyreoid cartilage disarticulated from its 

 facet on the side of the cricoid cartilage. An incision should now be made 

 through the right lamina of the thyreoid cartilage, a short distance to the 



VOL. II 27 



