Fig. 1. Egg and cumulus of maturing follicle in the ovary of Maccacus rhesus on day 13. 



Under higher power the egg shows the first maturation spindle. The granulosa is beginning 



to show a loosening up due to the appearance of edema fluid. The theca interna is thin 



and delicate. The diameter of this normal follicle was seven thousand micra. 



