CILIATED EPITHELIA ULTRASTRUCTURE 



bound ]iy these membranes. The mucous state when the upper part of the mucous cell 



granules appear, howe\-er, within the smooth is transformed into a goblet filled by numer- 



membranes of the Golgi apparatus where a ous large mucous granules. A certain fusion 



heavy accumulation of various sized mucous of mucous granules occiu's intracellularly 



granules can be identified previous to the before they are discharged at the surface of 



1 



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Lff. 



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Fig. 3. Each cilium emerges into the lumen from a basal body. Rootlets (r) and 

 a lateral fibrillar projection (arrow) secure the ciliary filaments in the luminal part 

 of the cell cytoplasm. The lateral ciliarj' filaments are continuous from the ciliarj^ 

 body to the tip of the cilium. The central filaments cannot be demonstrated within 

 the basal body. Magnification 39,000X 



Fig. 4. Cross sectioned cilia display a ring of nine paired peripheral filaments and 

 two central single filaments. The plasma membrane which shows up as a .single dense 

 line is well preserved in all but two cilia. Magnification 100,000X 



119 



