264 



ELEMENTS OF HISTOLOGY. [Chap. xxxn. 



mentioned, and when this thickened epithelium sepa- 

 rates into the nests and ovarial tubes, there is a 

 continued formation of primitive ova i.e., cells of 

 the nests undergo the enlargement of cell-body and 



Fig. 143A.. From a Vertical Section through the Ovary of a 

 new-born Child. 



a, Germinal epithelium; &, ovarian tube: c, primitive ova; d, longer tubes be- 

 coming constricted off into several Graaflsin follicles; e, larwe nests; /. 

 isolated finished Graaflan follicles; g, blood-vessels. (Waldeyer, in Strieker's 

 Manual.) 



nucleus, by which they are converted into primitive 

 ova. Like the other epithelial cells, the primitive 

 ova of the nests and ovarial tubes undergo division 

 into two or even more primitive ova after the mode 

 of karyokinesis (Balfour). Thus each nest contains 

 a series of ova. 



353. The ordinary small epithelial cells of the 

 nests and ovarial tubes serve to form the membrana 

 granulosa of the Graafian follicles. According to 



