58 LABORATORY METHODS OP 



to observe the lines of Hensen and the membrane of 

 Krause. These lines are located in the sarcous ele- 

 ments. The sarcous elements are composed of the fol- 

 lowing parts, viz. : a spindle-shaped body, light space, 

 and a bill. Placed end to end they make a fiber or cell. 

 The lines of Hensen are those lines seen dividing the 

 spindle-shaped bodies, and the membrane of Krause is 

 the membrane or line drawn across the light bands. 

 The following wrappings are found enveloping the 

 muscle: endomysium, the membrane around the fiber. 

 A number of fibers (wrapped in the endomysium) is 

 put together and forms a bundle; this bundle is 

 wrapped in another membrane, called a perimysium. A 

 number of these bundles is put together and enveloped 

 in another membrane, called epimysium.' 



Involuntary Muscle. This variety of tissue is net 

 under the control of the will. The cells are fusiform 

 in shape, and have their nuclei centrally located. They 

 are joined together by overlapping each other; ait the 

 point where the cells meet a cement substance is seen. 

 They are found in the tissues that are not under the 

 control of the will, i. e., the intestines, uterus, and rec- 

 tum. 



Heart Muscle. This variety of muscle is found only 

 in the heart, and is not the same as the involuntary 

 muscle, in shape or function. The cells are short, rec- 



