MUSCULAR SYSTEM. ' 215 



A. The aponeurosis between them and the skin, and 

 the 1 periosteum between them and the bones, form for them 

 a fibrous sheath, in which they play. 



Q. Where are the longest of these muscles ? 



*ft. The external muscles are the longest; the deep- 

 seated the shortest. 



Q. What separates the muscles from each other? 



#. Cellular layers are interposed between the muscles. 



Q. How are the long muscles divided? 



ft. Into the simple and compound. Composed of a sin- 

 gle fasciculus, they are single; where fasciculi unite, the 

 muscles are compound. 



Q. What purpose is served when several of the long 

 muscles are united by aponeurosis ? 



/2. The force and direction of muscular power are 

 concentrated. 



2. Of the Broad Muscles. 



Q. Where are they generally found? 



/?. Covering the parieties of the cavities of the body. 



Q. What offices do they perform ? 



ft. Three; they in some extent contribute to the for r 

 mation of the parietes; they protect the contained organs; 

 and aid these last in the discharge of their functions by 

 the motions they communicate. 



Q. Why is cramp never felt in these broad muscles? 



t#. As cramp arises from the displacement of a muscle, 

 and as these broad muscles are not liable to dislocation, 

 they do not suffer from cramp. 



Q. The circumstance of these broad muscles not being 



