INVOLUNTARY OR NON-STRIATED MUSCLE. 63 



FIG. 30. 



out special preparation of the specimen. Laterally the cells 

 are not closely crowded, but are separated 

 by slight intervals filled with delicate con- 

 nective tissue and vascular channels. The 

 cells have no separable sarcolemma. Each 

 cell has a single nucleus, situated in the 

 centre of its protoplasm. The cells are 

 somewhat striated both longitudinally and 

 transversely. 



Involuntary or non- striated muscle (Fig. 30) 

 is widely distributed throughout the viscera, 

 being found in especial abundance in the 

 alimentary canal, bloodvessels, bladder, and 

 uterus. Its movements are not under the 

 control of the will, but are of an automatic 

 nature and are more slow and continuous 

 than those of the voluntary muscles. 



Involuntary, non-striped, or smooth mus- 



Fio. 29. 



Cardiac muscle (Dunham), a. nucleus ; 

 6, c, cytoplasm ; d, cement at junction 

 of cells; e, areolar or "interstitial" 

 tissue between the cells ; /, capillary. 



Involuntary muscle- 

 cell (Schafer.) The 

 nucleus is not repre- 

 sented sufficiently 

 long. 



cle-cells are slender and fusiform in shape, each with a single 



