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Colloidal carbon was injected i.v. in mature virgin rabbits at different times after induction of ovulation by human chorionic gonadotrophin (hCG, 100 iu) or mating. Before induction of ovulation, slight carbon leakage was observed in the inner vascular ring of the theca interna of antral follicles, but blood vessels in the other ovarian compartments were unstained. Between 4 and 10.5 h after hCG-treatment or mating, vascular leakage was most marked in the blood vessels of the interstitial gland and in the theca interna of antral follicles. Just before ovulation, carbon particles were observed between granulosa cells and some carbon was seeping into the follicular fluid of preruptured follicles. Vascular leakage was also observed over the follicle dome before rupture as well as at the dorsomedial junction between the mesovarium and the ovary. The blood vessels stained with carbon were 7-70 microns diameter, representing capillaries and postcapillary venules. About 6 h after hCG injection, an increased number of polymorphonuclear leucocytes migrated from the vessels of these ovarian compartments into the surrounding interstitial tissue. The number of leucocytes seen in the follicular wall and ovarian medulla increased markedly towards ovulation. During early corpus luteum formation, the number of leucocytes decreased markedly. The localized vascular changes seen after mating and hCG stimulation were similar to an inflammatory reaction and could form the basis for the formation of peritoneal exudate after ovulation in rabbits and periovulatory ascitic accumulation seen in the peritoneal cavity of women during the menstrual cycle.

Localized increases in ovarian vascular permeability and leucocyte accumulation after induced ovulation in rabbits