118 



MUSCLE TISSUE 



band. The crossed striations are due to the change in 

 the light and dark disks or bands. 



The sarcolemma does not possess the inherent 

 quality of contractility, but the sarcoplasm does. 



FIG. 59 



FIG. 60 



Part of a fiber of cross-striped muscular 

 tissue, showing the alternating bands. 

 (Gerrish.) 



Diagram showing the minute 

 structure of cross-striped 

 muscular tissue. (Gerrish.) 



It has been shown that the fibrillye form the fibers, 

 the latter being grouped into primary bundles called 

 fasciculi, and these primary bundles are collected into 

 a series of bundles called secondary bundles, and groups 

 of the latter form the completed muscle. Each muscle 

 is surrounded by a sheath of white fibrous tissue called 

 the epimysium, which gives off septa or layers from 



