CHAPTEK IV 



CHANGES IN THE OVARY OOGENESIS GROWTH 

 OF FOLLICLES OVULATION FORMATION OF 

 CORPORA LUTEA AND ATRETIC FOLLICLES 

 THE SIGNIFICANCE OF THE PROCESTROUS 

 CHANGES IN THE UTERUS 



"The newest freak of the Fallopian tubes and their nmbrite, and the 

 very latest news from the ovisac and the corpora lutea." JOHN BROWX, 

 Hone Subscti i-'i . 



DEVELOPMENT OF OVARY AND OOGENESI- 



THE animal egg is a large spheroidal cell consisting of external 

 protoplasm or cytoplasm, a nucleus or germinal vesicle, and a 

 nucleolus or germinal spot. 1 Within the cytoplasm is a mass of 



FIG. 23. Section through ovary of cat. (Schron.) 



1, Outer surface ; 1', attached border ; 2, fibrous central stroma ; 3, peripheral 

 stroma ; 4, blood-vessels ; 5, ymng follicles ; 6, 7, 8, 9, and 9', larger 

 developing follicles ; 10, corpus luteiim. 



food material or yolk (sometimes known as deutoplasm), the quantity 

 of which varies slightly in different Mammalia, and is very con- 

 siderable in birds and certain other animals. The unfertilised ovum 

 differs from the male germ -cell or spermatozoon in its devoting itself 

 mainly to the storage of food-substance and accumulation of potential 



1 A centrosome has been described as present in the ova of some animals. 

 For a detailed description of the ovum in different forma 966 Wilson, '/'/-. r,-// 

 in Development -ind lnlcTit<i,><->\ I'nd Kdition, New York, 1!)<X). 



109 



