F.PTTITKLTUM 



77 



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It is thus seen that in stratified squamous epithelium only the 

 surface cells are squamous. This form of epithelium rests upon a 

 more or less distinct basement membrane, 

 which is frequently thrown up into folds by 

 papilLnc of the underlying connective tissue. 

 Stratified squamous epithelium forms the 

 surface of the skin and of mucous membranes 

 of cavities opening upon it, mouth and 

 oesophagus, conjunctiva, external ear, vagina 

 and external sheath of hair follicle. 



{h) Stratified Columnar Epithelium. — 

 Only the surface cells are columnar, the 

 deeper cells being irregular in shape. The 



Fig. 20. — Epithelial Cells 

 from the Stratum Spinosum 

 of the Human Ei)idcrmis 



surface cells frequently send long processes show ins "Intercellular 



II- 11 T^u f Bridges." X7oo- (Szymo- 



down among the underlying cells, ihe tree nowicz.) 



surface is often marked by a well-developed 



cuticula. Some epithelia of this type are cihated. Stratified 



columnar epithelium is found in the larynx, nose, palpebral con- 







Fig. 21. — Transitional Epithelium from the Human Bladder. 



junctiva, largest of the gland ducts, the vas deferens, and part of 

 the male urethra. 





r -K-v 





Wpf'-^' 



9 --> ^,. ^, 



Fig. 22. — Stratified Columnar Epithelium from the Human Male Urethra. X4oo- 



Stratified epithelium composed of only from three to six layers of 

 cells is sometimes designated '''' transitional epithelium^ This 



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