102 MUSCULAR SYSTEM. 



Attachment. — To the anterior border of the cricoid cartilage ; 

 and to the side of the posterior angle of the arytenoid. 



Action. — To draw the arytenoid cartilages asunder, and thus 

 dilate the glottis. 



THYRO-ARYTENOIDEUS. 



Situation. — Upon the side of the larynx, between the thyroid 

 cartilage and the lining membrane. 



Attachment. — To the inner surface of the thyroid, and the tri- 

 angular ligament; and to the side of the arytenoid cartilage. 



Action. — To enlarge the glottis by separating the arytenoid 

 cartilages. 



ARYTENOIDEUS. 



Situation. — Upon the superior part of the larynx. 



Attachment. — To the superior or excavated parts of the two 

 arytenoid cartilages ; running across from one to the other. 



Action. — To contract the glottis, by approximating these carti- 

 lages. 



HYO-EPIGLOTTIDEUS. 



Situation. — Between the epiglottis and semicircular part of the 

 OS hyoides. 



Figure. — Fusiform. A single muscle. 



Attachment. — To the hollow part opposite to the neck of the 

 OS hyoides ; and to the broadest part of the epiglottis : en- 

 veloped within a doubling of the laryngeal membrane, and 

 clothed in adipose matter. 



Structure. — Pale fleshy fibres, mingled with fatty matter at 

 its hyoideal attachment, and fixed to the epiglottis by a very 

 small tendon. 



Action. — To retract the epiglottis still further from the aper- 

 ture, and thus increase the dimensions of the latter. 



10.— PALATINE REGION. 



Including one pair, and a single muscle. 



TENSOR P ALATI . Stl/lo-stciphl/kus. 



Situation. — Upon the supero-lateral part of the pharynx. 



Form. — Slender, elongated ; tapering towards either extremity. 



Attachment. — Posteriorly, to the styloid process of the tem- 

 poral bone, by means of a tendon common to it and the stylo- 

 pharyngeus ; anteriorly, by means of a cartilaginous loop (acting 

 as a pulley), through vvhicli its tendon passes, to the styloid 

 process of the palate bone: and, making a sudden turn outward. 



