importance features to which attention has been directed are : changes in the vascularization of the follicle , the appearance of an avascular area known as the macula pellucida or stigma , the formation of small blood clots near the stigma and some extravasation of blood , and the rupture of the follicle at the stigma and exist of the oocyte and follicular fluid .
C0018120
follicle
C0029045
oocyte