GLANDULAR EPITHELIUM. 



45 



are in several layers (the outer only being columnar), occurs 

 in the olfactory nasal membrane and a portion of the vas 

 deferens. 



Columnar epithelium ciliated : A variety of epithelium in 



FIG. 13. 



Simple columnar epithelium and goblet cells, from the intestine, Shows the stri- 

 ated free cuticular margin of the cells in this situation. 



which the exposed surfaces or ends of the cells are covered 

 with cilia, which in life are in characteristic wave-like motion. 



Simple ciliated epithelium occurs in the Fallopian tubes, 

 uterus, central canal of the spinal cord, and brain ventricles. 



In stratified ciliated epithelium (Fig. 14) the cells form seve- 

 ral layers. Only those of the outer layer are columnar and 

 ciliated ; those of the lower 

 layers, the germinal cells, are FIG. 14. 



rounded or pear-shaped, be- 

 low and between the columnar 

 cells, into which they ulti- 

 mately develop. This variety 

 covers the respiratory tract, 

 Eustachian tubes, and epidid- 

 ymis. 



Goblet epithelium-cells (Fig. 

 13) are large elliptical or pyri- 

 form cells, with their larger ciliatedcolumnar epithelium (stratified)) 



ends outward and their nuclei from trachea, showing ciliary wave. 



near their bases. They occur 



scattered among columnar epithelium-cells. Their bodies 

 have a clear unstained, distended appearance, being filled with 

 a mucinous substance which they secrete and discharge on the 

 surface of the mucous membrane. 



Glandular epithelium is that which forms the secreting 



