REPRODUCTIVE ORGANS IN ANIMALS 29 



Fig, 17. — Corpus luteum of mouse fully formed. (From Sobotta.) The 

 luteal tissue is vascularised and the central cavity filled in with 

 connective tissue. 





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Fig. 18. — Section through follicle in early stage of degeneration, (From 

 Sellheim.) The ovum and follicular epithelium are in process of 

 atrophy. 



