ACTIVITIES OF THE OVARY 



77 



the follicle-stimulating and luteinizing hormones, it moves closer to the ovarian 

 surface (fig. 30). The surface of the ovary over the ripening follicle bulges 

 outward, forming a mound-like protuberance (fig. 30). In the rabbit as shown 

 by Walton and Hammond ('28) and Hill, Allen, and Cramer ('35) the cen- 

 tral part of the original protuberance pushes out still further and forms a 

 papilla-like swelling (fig. 48A-D). As the papilla develops, it becomes avas- 



BULGING WALL OF GRAAFIAN 

 FOLLICLE FROM OVARIAN SURFACE 



ftJf^S. 



Fig. 48. Process of ovulation in the rabbit. (A-C) Early external changes of the 

 surface of the ovary overlying the bulging Graafian follicle. (D) Formation of a sec- 

 ondary papilla. (E) Rupture of the secondary papilla with discharge of egg and folli- 

 cular fluid, the latter oozing down over ovarian surface of the follicle. (F) Area of 

 rupture with oozing follicular fluid and egg greatly magnified. (G) Follicle after egg 

 discharge. (A-E and G, slightly modified from Walton and Hammond, Brit. J. Exp. 

 Biol., 6; F, modifiec from Hill, Allen, and Kramer, Anat. Rec, 63.) 



