96 PRACTICAL HISTOLOGY [XII 



Note that the cells generally resemble unstriated muscle cells 

 in shape, but are much shorter and are transversely striated. 

 By this method the striation is not marked. 



Some cells may be seen with branches or with flattened 

 expansions. 



DEMONSTRATIONS. 



1. Longitudinal section of the intestine of cat or 

 dog at right angles to the surface. (Alcohol or *2 p.c. 

 chromic acid ; hsematoxylin.) In the longitudinal coat, 

 note the sheet of muscle cells with elongated stained 

 nuclei ; in the circular coat, which is cut transversely, 

 note the bundles of muscle cells ; the nuclei are only 

 seen in some of the cells ; they appear as round, deeply 

 stained central spots. 



2. Muscular coats of intestine of frog treated with 

 nitrate of silver. Note the black lines of cement 

 substance between the muscle cells (cp, Le^s. xvii. 2). 



3. Transverse section of worm (osmic acid). Note 

 the band shape of the longitudinal fibres, and their 

 attachment at one edge. 



4. Section of ventricle of a small mammal (alcohol ; 

 hsematoxylin). Note the meshwork formed by the 

 junction of the cells, and the hyaline cement substance 

 at the junctions. 



NOTES. 



Isolation of unstriated muscle. Potassium hydrate 35 to 

 40 p.c. affords the readiest means of isolating muscle cells united 

 by cement substance, whether the cells are unstriated or cardiac. 



The cells when isolate may be preserved by throwing them 



