DPESSHECTION OF “THE NECK; 73 
through the trachea below the larynx and through the 
pharynx above the hyord bone; tn taking out the larynx 
dissect wt free from the esophagus, which adheres to tts 
dorsal side. The intrinsic laryngeal muscles form stx 
patrs, and with the exception of the arytenord muscles 
correspond very well to those of human anatomy. The 
wllustrations in the text-book of human anatomy may 
therefore be consulted tf necessary. 
a. THE Crico-rHyroip MuUscLeis a short triangular 
muscle arising from the ventral and lateral faces of the 
cricoid, and is inserted into the posterior border of the 
thyroid and its posterior cornu. 
b. THE POSTERIOR CRICO-ARYTENOID MUSCLE arises 
from the flattened dorsal surface of the cricoid, and 
is inserted into the arytenoid cartilages, the fibres 
passing obliquely forward and outward. 
c. THE LATERAL CRICO-ARYTENOID is concealed by 
the wing of the thyroid. Cut through the posterior 
horn of the thyroid where it joins the cricoid and 
lift up the wing of the thyroid. ‘The muscle is seen as 
a band of fibres arising from the lateral surface of the 
cricoid, and passing obliquely toward the dorsal side 
to be inserted into the arytenoid. 
d. THE THYRO-ARYTENOID MUSCLE 1s anterior to 
the last, the fibres having somewhat the same general 
direction. It consists of two nearly separate muscular 
bands which arise from the internal face of the ventral 
portion of the thyroid and pass dorsally to be inserted 
into the arytenoid. 
e. THE ARYTENO-EPIGLOTTIDEAN lies anterior to the 
last and nearly parallel with it. It arises from the 
arytenoid cartilage and passes ventrally and forward 
to endin the aryteno-epiglottidean fold. The muscles 
