^24 



INTERNAL SECRETIONS 



in the ovaries of all mammals. Since the interstitial tissue in 

 some species is certainly due to folHcular atresia, it seems 

 justifiable to identify also as an essentially similar tissue that 

 which is derived from atretic follicles in the ovary of man and 



Fig. 103. — Young Graafian follicle in rabbit 11^ months old 

 (Prot. Nr. 47). X 200. The granulosa, theca interna 

 and theca externa are to be seen. Compare also the 

 size of the interstitial cells in Fig. 102 and Fig. 103. — 

 Prepar. of Wagner; photo of KuU. 



other mammals, in which, according to some authors, an 

 interstitial tissue is absent. The only difference is that, in the 

 first, the cells originating from the theca interna of the atretic 

 folHcles form a compact parenchymatous tissue, the so-called 

 "interstitial gland" of Bouin and Limon, whereas, in the 



