4 
ANATOMY OF THE HORSE. 
Form .—Quadrilateral: flat and thin. 
Attachment .—To the inferior border of the semicircular por¬ 
tion of the os hyoides; and to a broad eminence upon the postero- 
inferior part of the side of the thyroid cartilage. 
Action .—To elevate the thyroid cartilage, and with it the 
larynx altogether; or, to depress the os hyoides. 
CRICO-TH YROIDEUS. 
Situation .—Upon the postero-lateral part of the larynx. 
Form .—Flat; triangular. 
Attachment .—To the borders and side the cricoid cartilage; 
and to the posterior border of the thyroid, filling up the vacuity 
between the two cartilages. 
Action .—To approximate the two cartilages. 
* .. . 
CRICO-ARYTENOIDEUS POSTICUS. 
* ' v , • 
Situation .—Upon the upper part of the larynx. 
Attachment .—To the entire upper surface of the cricoid carti¬ 
lage, and to the posterior angle of the arytenoid cartilage. 
Structure .—Fleshy; and furnished with two small tendons, 
which are fixed to the arytenoid. 
Action .—To draw the arytenoid cartilage backwards. 
CRICO-ARYTENOIDEUS LATERALIS. 
Situation .—Postero-lateral and superior parts of the larynx, 
between the thyroid and cricoid cartilages. 
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. 
