HANDBOOK OF PHYSIOLOGY. 



when viewed in section, is termed the " striated basilar border" (Fig 

 20, A, 0). 



FIG. 20. A. Vertical section of a villus of the small intestine of a cat. a. Striated basilar bor- 

 der of the epithelium. 6. Columnar epithelium, c. Goblet cells, d. Central lymph-vessel <. 

 Smooth muscular fibres. /. Adenoid stroma of the villus in which lymph corpuscles lie. B. Goblet- 

 cells. (Klein.) 



Columnar cells may undergo a curious transformation, and from 

 the alteration in their shape are termed "goblet-cells" (Fig. 20, A, c, 



FIG. 21. Columnar epithelial cells from 

 the intestinal mucous menbrane of a cat. a 

 and 6, small cells of the lower layer ; c, 

 superficial layer ; d, goblet cells. (Cadiat.) 



FIG. 22. Columnar ciliated cells from the 

 human nasal membrane : magnified 300 

 diameters. (Sharpey.) 



and B). These are hardly ever seen in a perfectly fresh specimen: but 

 if such a specimen be watched for some time, little knobs are seen 



FIG. 23. -A. Spheroidal ciliated cells from the mouth of the frog. X 300 diameters. (Sharpey.) 

 B. a. Ciliated columnar epithelium lining a bronchus, b. Branched connective-tissue corpuscles. 

 (Klein and Noble Smith.) 



gradually appearing on the free surface of the epithelium, and are finally 

 detached; these consist of the cell-contents which are discharged by the 



