CELL LLTKASTRUCTURE L\ MAMMALS 



Jk. .Xj 



Fig. 8. Detail of epithelial cells of the human ductus efferens (connection between 

 the testis and the epididymis). The surface of the cell's is provided with brush border 

 extensions (B) extending into the lumen (L) of the duct. Tubular invaginations (T) 

 of the surface membrane descend into the upper part of the cells. The cell boundaries 

 (CB) are held together by terminal bars (Tb) close to the surface, and by desmosomes 

 (De) at lower levels. Except for mitochondria (M), these cells display large dense 

 granules (D) as well as extremely osmiophilic bodies (P) , some of which may represent 

 pigments, others lipid granules. A large vacuole (Va) is seen in the center. Magnifi- 

 cation 26,000X 



99 



