78 



STUDENTS HISTOLOGY 



with a single cut with the curved scissors, and place it in a saucer 

 of water. Proceed to brush it, under the water, with two camel's- 

 hair pencils, so as to remove all of the cells from the inner surface. 

 It will bear vigorous rubbing with one of the brushes, holding it 

 at the same time with the other. Transfer to alcohol for ten 

 minutes, and afterward stain with hsematoxylin and eosin. While 

 in the oil, cut the tissue into small pieces, and mount flat in 

 balsam. Examine with L and H. 



Observe the bands of involuntary muscle crossing in various 

 directions. You will distinguish between the muscle and the con- 

 nective tissue cells by their nuclei. 



STRIATED MUSCULAR TISSUE 



A skeletal or striated muscle consists of cylindrical fibers, vary- 

 ing from 10 p to 100 p- in diameter and 5 to 12 cm. long. These 

 primitive fibers are supported by a delicate, transparent sheath 

 the sarcolemma. They are aggregated, forming primitive fasciculi, 

 which are again united to form the larger bundles of a complete 



FIG. 53. PART OF A MUSCLE FIBER. (RANVIKR.) 



A. Dark disk. 



B. Membrane of Krause. 

 0. Light disk. 



N. Muscle nucleus. 



muscle. The connective tissue uniting the primitive fibers is 

 termed endomysium; while that uniting the primitive bundles is 

 the perimysium. 



The primitive muscular fibers exhibit marked cross striations 

 with faint longitudinal markings, the former being produced by 

 alternate dark and light spaces. 



