586 



PHYSIOLOGY OF GONADS 



than i.< commonly thought (Bartehnez, 

 1957). The reduction in thickness is clue pri- 

 mariiy to loss of ground substance from the 

 stroma, and conversely, the outstanding 

 feature of repair is the increase in stromal 

 ground substance (Fig. 9.23). ^Mitoses are 

 rarely seen in the stroma during repair and 

 arc not abundant enough in any phase ac- 

 cording to Bartelmez to account for the ob- 

 served increase in thickness of the endome- 

 trium. Our present knowledge indicates that 

 an explanation of menstruation may be 

 found in the metabolic effects induced in the 

 stromal connective tissue of the endome- 

 trium by a sudden withdrawal of a support- 

 ing hormonal stimulus. 



XI. References 



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Allen. E. 1928. Further experiments with an 

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