XXXII.] TISSUES OF BEPEODUCTION. 337 



d. Deeper (older) Graafian follicles of various 

 sizes scattered throughout the rest of the 

 stroma, in each of these there is a more 

 or less considerable clear space. 



e. One or more corpora lutea (unless the 

 ovary has been taken from a young animal). 

 The corpora lutea vary greatly in size and 

 appearance according to their age, they 

 consist of radiating bands of stroma, between 

 which are a number of granular polygonal 

 cells; if the corpus luteum is young there 

 will be pigment (from effused blood) in its 

 centre. 



2. Observe with a high power 



a. The peripheral parts of the stroma consist 

 chiefly of elongated spindle-shaped cells. 



6. The small Graafian follicles. Note in these 



a. The ovum, large and spherical, within 

 it lies a comparatively large spherical 

 nucleus, the germinal vesicle, in 

 which may be seen a nucleolus, the 

 germinal spot. 



j3. The membrana granulosa, a layer of 

 flattened epithelium cells immediately 

 surrounding the ovum. 



7. The thin membrana propria enclosing 

 the membrana granulosa. 



In the smallest Graafian follicles the membrana 

 propria will not be seen, in the larger ones the 

 L. 22 



