STRIPED MUSCLE 



113 



called sarcolemma, beneath which nuclei (n) occur at 

 intervals. It will be seen that striped muscle, unlike 

 the tissues previously considered, does not appear to be 

 composed of cells, although the occurrence of nuclei 

 seems to indicate their presence. In the embryo, 

 however, the muscle is formed of ordinary nucleated 



B // 



FIG. 32. A, part of a fresh muscular fibre of a Frog. B, the same after treatment 

 i. u u T distilled water followed by methyl-green. ( x about 150.) 

 b. bright bands ; d. dim bands ; n. nuclei ; s, s'. sarcolemma, rendered visible as a 

 minute blister (s') by absorption of water and by the rupture of the muscle-fibre 

 at s. (A, from Huxley's Physiology.) 



cells, which, as growth goes on, increase in length while 

 their nuclei multiply by fission, each enormously 

 elongated cell thus containing a considerable number. 



Connective-tissue. We will next examine a piece of 

 the delicate web of connective-tissue which binds the 

 muscles together. 



Under the high power, connective-tissue is seen to be 



PRACT. ZOOL. 



