NORMAL HISTOLOGY. 



75 



CHAPTER IX. 



MUSCULAR TISSUE. 



Muscle is a tissue derived from the mesoderm. It is composed of 

 cells and a small amount of intercellular substance, and is endowed 

 with the property of contractility. 



OUTLINE OF MUSCULAR TISSUE. 



1. Kinds. 



3. Functions. 



2. Structure. . 



Smooth in all involuntary muscle except heart and 



pharynx. 

 Striated in heart, O3sophag % us, and all voluntary muscle. 



' Smooth 

 muscle . . J 



Form. 

 Structure. 



Striated 

 muscle. . 



f Cells 



Bundles. 



Strata. 



f Epimysium. 

 Sheaths . . <j 



[_ Perimysium. 



Fasciculi, composed of fibres. 



f Sarcolemma. 



f Cells <( Sarcoph 



I 



1 Nuclei. 



Fibers. . . . \ 



( Fibrillae. 



S a r c os - 

 tyles . . . 



Discs. 



Dark. 

 Lateral. 



Interme- 

 diate. 



There are two kinds of muscular tissue (1) smooth, or vegeta- 

 tive; (2) striated, or animal. 



Smooth muscle is associated with all involuntary muscles except 

 the heart and pharynx, and is found, therefore, in the digestive tract, 



