250 THE VISCERA. 
fibres pass craniolaterad, converging. The lateral fibres are 
nearly longitudinal in direction. 
Insertion.—The dorsal border of the caudal end of the 
arytenoid cartilage (4). 
Action.—Moves the arytenoid on its oblique articulation 
with the thyroid. The apex of the arytenoid is thus carried 
laterad, and the vocal cords are separated so as to widen the 
glottis. 
Fic. 105.—MuscLES OF THE LARYNX, AS EXPOSED BY REMOVAL OF MOST OF 
THE LeFT HALF OF THE THYROID CARTILAGE, 
1, epiglottis; 2, portion of the thyroid cartilage (cut); 3, cricoid cartilage; 4, 
arytenoid cartilage; 5, trachea. a@, M. arytenoideus transversus; 4, M. cricoarytenoi- 
deus posterior; ¢, M. cricoarytenoideus lateralis; ¢, M. thyreoarytenoideus. 
M. artyenoideus transversus (Fig. 105, a).—A small 
unpaired muscle running transversely between the caudal ends 
of the arytenoid cartilages, just beneath the mucous membrane 
and parallel to the cranial border of the cricoid cartilage. 
M. glossoepiglotticus.—A smal! longitudinal muscle, lying 
by the side of its fellow in the frenulum of the epiglottis. 
Origin.—The median fibrous septum of the tongue. 
Jnsertion.—The dorsal (cranial) surface of the epiglottic 
cartilage in the median line near its attached border. 
Action.—Draws the epiglottis craniad. 
M. hyoepiglotticus is a small bundle of parallel fibres lying 
in the frenulum of the epiglottis craniad and dorsad of the body 
of the hyoid bone. 
Origin.—The lateral end of the cranial surface of the body 
of the hyoid. The two muscles pass craniodorsad, converging, 
and unite with the preceding. 
Jnsertion with the preceding. (The lateral portion of the 
muscle may continue craniad to the tongue as a second part of 
the hyoglossus. ) 
Action,—Like the preceding. 
