LESSON XIII. 

 STRIATED MUSCLE. 



1. Striated muscle of frog. Cut through the 

 skin of the front of the thigh of the frog, note the 

 band-like sartorius muscle running somewhat obliquely 

 across the thigh from the pelvis to the knee, seize with 

 forceps the connective tissue lying along each border 

 and tear it away from upper to lower end. 



Take up with fine forceps a few fibres at one end of 

 the muscle, and gently pull them out to the opposite 

 end. Stretch out the bundle on a dry slide, separate 

 the fibres a little in the centre, place a bristle across 

 them and press gently ; remove the bristle and put on 

 a cover-slip. 



a. Note (h. p.) the fairly transparent muscular 

 fibres and their varying size. 



The transverse striation; alternate dim and light 

 bands, the thick discs and light discs passing through 

 the whole thickness of the fibre. 



Longitudinal granular lines or rows of small granules, 

 indicating the sarcoplasm, varying greatly in number 

 and distinctness in different fibres. 



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