ORIGIN OF THE COHl'l'S LUTEUM 



163 



Meanwhile, changes have also been taking place in the large 

 cells of the theca interna. Mitoses are more common, and the 

 former definite internal limit of this layer has been blurred by 

 the breaking-down of the membrana propria and the ingrowth 

 of the capillaries at all points of the follicular wall. Within the 



ith int. 



th. extf' 



Fig. 17 Enlarged view of small part of figure 16 as indicated by rectangle, 

 showing blood-vessels of theca interna branching throughout granulosa. X 4"). 



cells there are changes in the lipoid inclusions which are their 

 chief distinguishing characteristic. In some cells of osmic 

 preparations the granules are larger, in others smaller than before; 

 in some they do not form an insoluble black compound with 



