DISSECTION OF THE NECK. ^l 



through the trachea below the larynx and through the 

 pharynx above the hyoid bone ; in taking out the larynx 

 dissect it free from the cesophagits, zuhich adheres to its 

 dorsal side. The intrinsic laryngeal muscles form six 

 pairs, and with the exception of the arytenoid muscles 

 correspond very zvell to those of human anatomy. The 

 illustrations in the text-book of human anatomy may 

 therefore be consulted if necessary. 



a. The Crico-thyroid Muscle is a short trianfrular 

 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 is 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-EPicLOTTiDEANlies anterior to the 

 last and nearly parallel with it. It arises from the 

 arytenoid cartilage and passes ventrally and forward 

 to end in the aryteno-epiglottidean fold. The muscles 



