30 



THE EPITHELIAL TISSUES 



Simple Squamous Epithelium.— The term squamous literally means 

 scaly, and epithelia of this type are composed of flattened, plate- 

 like cells whose cytoplasm is so scanty that the nucleus, which is 



Fig. 7. — A photograph of a surface view of simple squamous cells forming the top- 

 most layer of a frog's epidermis. 





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Fig. 8. — Photograph of a section through the kidney of a frog. Simple squamous 

 epithelial cells are shown lining the space surrounding the glomerulus. Cuboidal 

 cells form the walls of the surrounding sections of uriniferous tubules. The arterial 

 vessels are shown entering the glomerulus at the top. 



centrally placed, causes a slight bulge. (Fig. 7.) In some cases 

 the lateral faces or edges adjoining other cells are regular, but more 

 often the boundaries are irregular and interlock with irregularities 

 in adjacent cells. In sections, which may pass at right or even 



