42 



TISSUES 



lining the mouth cavity, pharynx, esophagus, epiglottis, 

 vocal cords, and the anus and vagina. 



Fro. 18 



Diagram of flat epithelium. I, seen from above; II, seen from the side 

 after transverse section on the line m. (a) cell boundaries as straight lines; 

 (6) cell boundaries as wavy lines. (Szymonowicz.) 



Diagrams of epithelium: a, nuclei at various levels; b, stratified pave- 

 ment epithelium; c, stratified cylindrical epithelium, ciliated at the right. 

 (Szymonowicz.) 



2. Columnar Cells. (a) Simple columnar cells are 

 arranged in tall columns consisting of a single layer with 

 a nucleus situated at the base of each cell. They are 

 found in the stomach and intestinal tract, anterior 

 portion of the male urethra, glands of Cowper and 

 Bartholin, prostate, gall-bladder, seminal vesicles, and 

 many gland ducts. Low columnar cells are often 

 called cuboidal. 



