652 



MANUAL OF PHYSIOLOGY. 



imbedded in a kind of capsule derived from the surrounding 

 areolar tissue of the stroma, and forms an immature Graafian 

 follicle. One of the cells grows rapidly to become the ovum, the 



FIG. 247. 



Section of the ovary of a cat, showing the origin and the development of 

 Gr;i;iliun follicles. (Cadiat.) a. Germ-epithelium, b. Graafian follicle 

 partly developed, c. Earliest form of Graafian follicle, d. Well-developed 

 Graafian follicle, e. Ovum. /. Vitelline membrane, g. Veins, h, /. Small 

 vessels cut across. 



rest increase in number to form the small cells of the granular 

 tunic. As the follicle develops, it works its way towards the cen- 



