158 Practical Zoology. 



the lateral crico-arytenoid muscle ; cut it away at its origin close 

 to the cricoid, and demonstrate its action on the arytenoid cartilage 

 and vocal cord. 



c, A broad muscle arising along the whole length of the angle 

 of the thyroid, whose fibers converge to the arytenoid cartilage. 

 This is the thyro-arytenoid muscle ; cut it across near its origin, 

 dissect it loose, and by pulling it toward its origin prove its 

 action. 



d. On the posterior surface of the arytenoids is the small 

 arytenoid muscle. 



13. Cut between the arytenoid cartilages and remove one of 

 them. Examine the joint -between the arytenoid and cricoid. 

 Note the synovia lubricating the joint. 



Trim away the muscle from the arytenoid cartilage and study 

 its shape more fully. Fit it again to its place, and recall the 

 motions given by each muscle. 



14. Now examine the arytenoid cartilage and the vocal cord 

 of the opposite side ; move the arytenoid back and forth, watch- 

 ing the vocal cord. 



15. Remove the epiglottis, and cut into it to see its structure. 



1 6. Dissect away the parts of the other side from the inside, 

 reviewing the above points. 



THE SKELETON OF THE RABBIT. 



Carefully clean the skeleton after dissecting away the muscles. 

 In preparing the skeleton in this way the student will learn many 

 facts as to the relations of the bones to the other tissues, that 

 he would not learn if he began with a well-mounted museum 

 skeleton. 



In removing the muscles' observe that the muscles of the 

 limbs lie parallel to the bones ; that the bones are largest at the 

 ends, while the muscles are thickest near the middle, thus 

 making the two fit each other better. Note that in the limbs 

 the muscles narrow at one end, or both, into a tendon, which, 

 usually at one end, passes over a joint to be attached to a bone 



