STRIATED MUSCLE 



79 



Under very high magnification each light band appears to be 

 crossed by a dark line, called the intermediate disk or membrane of 

 Kranse. The dark band consists of rows of spindle-shaped bodies. 



FIG. 54. STRIATED MUSCULAR FIBERS FROM THE TONGUE, TEASED AND STAINED 



WITH H^EMATOXYLIN (X 400). 



A. A fiber, with the muscle substance wanting, from stretching during the teasing, the sar- 

 colemma alone remaining. 



B. Partly separated disk of Bowman. 



C. Ultimate fibrillae. 



D. A blood-capillary. 



Those of the different dark bands are placed end to end, forming- 

 continuous elements. They constitute the contractile fibrillce. 

 The light bands correspond to the attenuated ends of the spindle- 

 shaped bodies. Little knobs on the ends of the spindles make 

 the dark line called the intermediate disk. The fibrilla? are 

 held in bundles by a pale sarcoplasm. In transverse sec- 

 tions of muscle these bundles show as polygonal areas Colin- 

 lie im 1 s fields. 



Macerate human muscle, preferably that from the tongue, in 

 dilute chromic acid for twenty -four hours, wash, tease in water, 



