RAT, A REPRESENTATIVE MAMMAL 



117 



efficient. The two common classes of levers used in the body are 

 (1) those in which the fulcrum lies between the load and the mus- 

 cular attachment, and (2) those where the fulcrum is at one end of 

 the lever, with the muscle attached in the middle, and the load at 

 the other end. 



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3~ 



k. 



en 



\ 



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^t>/l 



^ 



-%' 



) 



m cd o 



Pi 



-t-'4-» 



fc.+J o 

 0) •" K 



+j 3 O 

 m — 



C> C3 S 



O c! C 



d 0) oJ 



^- 



03 %se 





S" 



Ha Ch-T 



I Sh -'03 



a, o o 



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0) P 



fe 



The following table has been prepared to give a summary of 

 pertinent information concerning the conspicuous superficial mus- 

 cles of the rat: 



