1082 



SPLANCHNOLOGY 



The medial borders of the two muscles are separated by a triangular interval, 

 occupied by the middle cricothyroid ligament. 



The Cricoarytsenoideus posterior (posterior 

 cricoarytenoid) (Fig. 958) arises from the broad 

 depression on the corresponding half of the pos- 

 terior surface of the lamina of the cricoid cartil- 

 age; its fibers run upward and lateralward, 

 and converge to be inserted into the back of 

 the muscular process of the arytenoid cartil- 

 age. The uppermost fibers are nearly hori- 

 zontal, the middle oblique, and the lowest 

 almost vertical. 



The Cricoarytsenoideus lateralis (lateral 

 cricoarytenoid} (Fig. 959) is smaller than the 

 preceding, and of an oblong form. It arises 

 from the upper border of the arch of the 

 cricoid cartilage, and, passing obliquely up- 

 ward and backward, is inserted into the front 

 of the muscular process of the arytenoid cartil- 

 age. 



The Arytsenoideus (Fig. 958) is a single muscle, 

 filling up the posterior concave surfaces of the 

 arytenoid cartilages. It arises from the pos- 

 terior surface and lateral border of one ary- 

 tenoid cartilag6) and is i ns e r ted into the corre- 



showing 



Tubercle, of 

 epiglottis 



Cuneiform 



cartilage 



Corniculate 



cartilage 



}Arytce- 

 noideus 



Crycoarytce- 

 noideus 

 posterior 



Corniculate 

 cartilages 



Articular facet for 

 inferior cornu of 

 thyroid cartilage 



FIG. 958. Muscles of larynx. Posterior view. FIG. 959. Muscles of larynx. Side view. Right lamina 



of thyroid cartilage removed. 



spending parts of the opposite cartilage. It consists of oblique and transverse parts. 

 The Arytsenoideus obliquus, the more superficial, forms two fasciculi, which pass 



