TIM-: ORGANS 01 Nil MI DDL! 



61') 



Fig. 214. Cross Motion through the ovary of a 

 Rabbit 5 days old, after BAI.KOUR. Highly 

 magnified. 



k.e, Germinal epithelium ; u.ei, primitive (or 

 primordial) ova ; ei.b, egg-nests ; bi, connec- 

 tive tissue. 



M 



I'.enrath the germinal epithelium there i> to In- found, e\i-n .it that 

 time, embryonic Coliliecti\e ti->ue \\itli strllate e.-lUlA'), \\Jilcli an- 

 in an active Mate of proliferation. In tlii.s way there 

 the median >ide of the uiesonephros the ovarian ridire, \\hich i> 

 ated from tin- urinary tuhule> ly agnail quantity of <-iiil>r\ nnir 

 Mil)>taiice. 



similar to those of the Chick occur in Man.mak with 

 this litV'ivnrr. that the ger- 

 minal i -pit helium appears to 

 attain a much greater thick 

 DM* 



In olili-i -t' (IrNclop- 



iiM-nt tin- Ixmiuliiries between 

 the germinal epithelium, which 

 is in process of rapid prolife- 

 ration and therefore exhibits 

 numerous liiruivs of nuclear 

 division, and the underlying 

 connective tissue become less 

 and hss distinct. This ivsult> 

 from the simple fact that a 

 process of mutual iny/-<m /// 

 now occurs between the ej>it/<>- 

 l/ii Hi it/nf the embryonic con- 

 >' tissue (fig. 214). I 

 purpo>rly >ay a proc 

 mutual ingrowth, for I leave 

 it undetermined whether the 

 germinal epithelium in con- 

 sequence of its development 

 grows into tht- embryonic con- 

 nective tissue in the form of 



cords and distinct groups of cells, or wln-tln-r tin- connective tissue 

 penetrates with it> projections into the epithelium. Probably both 

 fcUSCU s aiv actively rnraged in the process. 



In the phenomenon of intergrowth. which continues for a long 

 time during development, two chief stages can be distinguished. 



At first there arise from the germinal epithelium both slender and 

 stout cords and balls of cells (figs. 214 and 215), which have received 

 from the name of their discoverer the designation PFLUCJEU'S egg-tubes. 

 Occasionally these are joined to one another by means of lateral 



kb 



Fig. 215. Section through an egg-nest of a Eabbit 



7 days old, after BAI KOIU. 

 ei, Ovum, the germinative vesicle (kb) of which 



e.vliil.its :i fil;ir n.-t \\oik : bi, connect r 

 stroma ; /.*, follicular cells. 



