158 ELEMENTARY HISTOLOGY 



delicate elastic sheath the sarcolemma which 

 will be visible in but few cases; it is most 

 readily seen at places where the fibre has been 

 torn across. 



ii. The alternate light and dark bands with which 

 the muscle fibres are marked transversely, 

 and from which the name, striated muscle, is 

 derived. 



iii. The readiness with which the fibres split up 

 longitudinally into fibrils. 



b. Frog's muscle. Shred gently apiece of fresh frog 1 s muscle 

 in normal salt solution : cover, and examine with the 

 high power : note ': 



i. The transverse striations. 



ii. The sarcolemma : best seen by slightly crushing 

 the specimen. 



iii. The nuclei in the fibres: seen on addition of 

 acetic acid. 



II. Non-striated, or Involuntary Muscle. 



Take a prepared specimen of frog's bladder which has been 

 macerated in Ranvier's alcohol for 24 hours ; pencilled with a 

 fine brush to remove the epithelium of the inner surface ; stained, 

 and cleared with oil of cloves. Mount in balsam, and examine 

 with low and high powers : note : 



i. The bands of muscular fibre. 



ii. The formation of each band by a number of 

 elongated, fusiform, nucleated muscle-cells. 



iii. The absence of transverse striation in the muscle. 



D. Connective Tissues. 



Under the name " connective tissue " are included various 

 tissues whose functions are mainly passive, and which serve 



